26-30 October 2015
Asia/Tokyo timezone
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Contribution List

Displaying 147 contributions out of 147
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Fermi Large Area Telescope (LAT) has been routinely gathering science data since August 2008, surveying the full sky every three hours. The first Fermi-LAT catalog of sources detected above 10 GeV (1FHL) relied on three years of data to characterize the >10 GeV sky. The improved acceptance and point-spread function of the new Pass 8 event reconstruction and classification together with six yea ... More
Presented by Dr. Alberto DOMINGUEZ on 26 Oct 2015 at 16:30
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
Determination of the Dark Matter (DM) density at the solar position is critical to direct and indirect dark matter searches. Additionally, it is important to make this determination with as few assumptions as possible, as results from direct detection searches are used to explore a wide variety of theoretical models, and hidden astrophysical assumptions could bias theoretical searches. Here we pre ... More
Presented by Mr. Hamish SILVERWOOD on 27 Oct 2015 at 14:17
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The IceCube Collaboration has observed a high-energy astrophysical neutrino flux using neutrino candidates with interaction vertices contained within the instrumented volume. A complementary measurement can be done with charged current muon neutrinos where the interaction vertex can be outside the instrumented volume. Due to the large muon range the effective area is significantly larger but the f ... More
Presented by Mr. Sebastian SCHOENEN on 29 Oct 2015 at 17:25
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
Accelerated expansion of our universe, as evidenced by Supernovae Ia (SNeIa), Cosmic Microwave Background (CMB) radiation anisotropies, Large Scale Structure (LSS) and X-ray experiments, is well documented in literature. A missing energy component, also known as Dark Energy (DE) with negative pressure, is widely considered by scientists as the responsible of this accelerated expansion. DE model, s ... More
Presented by Dr. Surajit CHATTOPADHYAY on 26 Oct 2015 at 15:08
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
Under rather generic assumptions, we show that in the asymmetric dark matter (ADM) scenario, the sign of the B-L asymmetry stored in the dark matter sector and the standard model sector are always the same. One particularly striking consequence of this result is that, when the dark matter decays or annihilates in the present universe, the resulting final state always involves an anti-neutrino. As ... More
Presented by Mr. Hajime FUKUDA on 26 Oct 2015 at 14:17
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Active galactic nuclei, including blazars, have been considered as cosmic-ray source candidates, and GeV-TeV gamma rays can be used as a powerful probe. I will discuss signatures of secondary gamma rays and their multi-messenger connection.
Presented by Prof. Kohta MURASE on 26 Oct 2015 at 14:00
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Rotation-powered pulsars release their rotational energy as relativistic magnetized plasma and create pulsar wind nebulae (PWNe) around them. Although magnetars are considered as magnetically powered pulsar, they also release their rotational energy by the wind. This is obvious from the fact that they are spinning down. We have been detected PWNe around energetic pulsars which have spin-down po ... More
Presented by Dr. Shuta TANAKA on 29 Oct 2015 at 15:30
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
I explain the excess of the antiproton fraction recently reported by the AMS-02 experiment by considering collisions between cosmic-ray protons accelerated by a local supernova remnant (SNR) and the surrounding dense cloud. The same "pp collisions" provide the right branching fraction to fit the observed positron excess simultaneously without a fine tuning. The supernova happened in relatively lo ... More
Presented by Dr. Kazunori KOHRI on 27 Oct 2015 at 15:30
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
Cartan has proposed a model of number systems given by octonions and a pair of 4 dimensional vector system. Octonions contains 2 quaternions or a pair of Dirac particles and by the transformation G_{23}, particle-antiparticle transformation occurs, and by the transformations G_{12},G_{123},G_{13} and G_{132}, supersymmetric transformation occur. We extend the model to the system in which quark, ... More
Presented by Dr. Sadataka FURUI on 26 Oct 2015 at 15:42
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
It is known that after Affleck-Dine baryogenesis, spatial inhomogeneities of Affleck-Dine field grow into non-topological solitons called Q-balls. In gauge mediated SUSY breaking models, sufficiently large Q-balls with baryon charge are stable while Q-balls with lepton charge can always decay into leptons. For a Q-ball that carries nonzero $B$ and $L$ charges, the difference between the baryonic c ... More
Presented by Mr. Jeong-Pyong HONG on 26 Oct 2015 at 14:34
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
In this talk, I will describe complementarity of direct detection and collider searches for Higgs portal DM models, and show that it is essential to work in renormalizable and gauge invariant DM models for collider searches (both the invisible Higgs decay and the monojet (or dijet) + missing ET). In particular we derive the bounds on new physics scale within a UV model, and show that it is complet ... More
Presented by Prof. Pyugwon KO on 26 Oct 2015 at 17:56
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
Recent precise observations of cosmic rays (CRs) by AMS-02 experiment clearly show (1) harder spectra of helium and carbon compared to protons by $¥propto R^{0.08}$, and (2) concave breaks in proton and helium spectra at a rigidity $R ¥sim 300$ GV. In particular the helium and carbon spectra are exactly similar, pointing to the same acceleration site. We examine possible interpretations of these ... More
Presented by Dr. Yutaka OHIRA on 27 Oct 2015 at 15:15
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
For over a decade the XENON Collaboration has been a pioneer in the field of dark matter direct detection. The collaboration has achieved world-leading sensitivities in WIMP-nucleon interactions using liquid xenon time projection chambers (TPCs), first with the XENON10 and later with the XENON100 experiments. This year the next phase, XENON1T, will begin data-taking with an unprecedented one ton f ... More
Presented by Dr. Daniel CODERRE on 29 Oct 2015 at 15:42
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
CALET (Calorimetric Electron Telescope), launched to the ISS in August, directly measures the electron+positron cosmic rays flux up to 20 TeV. With its proton rejection capability of 1 : 10^5 and an aperture of 1200 cm^2 sr, it will provide good statistics even well above one TeV, while also featuring an energy resolution of 2%, which allows it to detect fine structures in the spectrum. Such stru ... More
Presented by Dr. Holger MOTZ on 27 Oct 2015 at 15:08
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
Dwarf spheroidal satellites of the Milky Way are a prime target for dark matter indirect searches. E.g., upper limits on gamma-ray fluxes in their directions, obtained with the Fermi Large Area Telescope, have been recently used to update constraints on weakly interacting massive particles (WIMPs), excluding pair annihilating cross sections at the level of WIMP thermal relic cross sections for WIM ... More
Presented by Prof. Piero ULLIO on 27 Oct 2015 at 17:04
Session: Dark Matter
Track: Dark matter searches (direct and indirect)
DarkSide-50 (DS-50) at Gran Sasso underground laboratory, Italy, is a direct dark matter search experiment based on a TPC with liquid argon from underground sources. The DS-50 TPC, with 50 kg of active argon and a fiducial mass of ~37 kg, is installed inside an active neutron veto based on a boron-loaded organic scintillator. The neutron veto is built inside a water cherenkov muon veto. DS-5 ... More
Presented by Masayuki WADA on 29 Oct 2015 at 14:51
Session: Dark Matter
Track: Dark matter searches (direct and indirect)
An 800kg liquid xenon detector (XMASS) was constructed at Kamioka Observatory, Japan in 2010. XMASS can be made the low background region in center of detector by shield of the liquid xenon which eliminates the background in detector surface. A commissioning run was conducted from November 2010 to June 2012. We found the unexpected background in detector surface. In order to reduce these backgr ... More
Presented by Mr. Hiroshi OGAWA on 29 Oct 2015 at 15:08
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
When very high-energy photons (VHE, E>100 GeV) propagate over cosmological distances, they interact with background light by pair production. Observations of spectral features in the VHE band of extragalactic sources related to this energy-dependent absorption process with the H.E.S.S. array of Cherenkov telescopes allow measuring the spectral energy distribution (SED) of the extragalactic backgro ... More
Presented by Dr. Fabian SCHÜSSLER on 26 Oct 2015 at 17:13
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
The framework of non-relativistic effective field theory (NREFT) aims to generalise the standard analysis of direct detection experiments, which is typically framed in terms of spin-dependent (SD) and spin-independent (SI) interactions. I will show that a number of these more general NREFT operators lead to distinctive new directional signatures, such as prominent ring-like features in the directi ... More
Presented by Dr. Bradley KAVANAGH on 27 Oct 2015 at 14:34
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
We point out that domain wall formation is a more common phenomenon in the Axiverse than previously thought. Level crossing could take place if there is a mixing between axions, and if some of the axions acquire a non-zero mass through non-perturbative effects as the corresponding gauge interactions become strong. The axion potential changes significantly during the level crossing, which affects t ... More
Presented by Mr. Ryuji DAIDO on 26 Oct 2015 at 14:51
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
Probing the thermal WIMP paradigm for Dark Matter is one of the primary goals of the high energy physics community. To study the interplay of the LHC with direct and indirect detection experiments, it is necessary to study benchmark WIMP models. I will do so by adding to the Standard Model an electroweak multiplet, which is arguably the simplest way to realise such a study. Besides that, these DM ... More
Presented by Dr. Filippo SALA on 26 Oct 2015 at 17:39
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The Telescope Array (TA) experiment is the largest cosmic ray detector in the Northern Hemisphere. The TA surface detector (SD) array is deployed on a square grid of 1.2 km spacing, covering an effective area of 700 km^2. The TA SD is overlooked by three fluorescence detector (FD) stations: Black Rock Mesa (BRM), Long Ridge (LR), and Middle Drum (MD). The TA BRM and LR stations cover 3 to 33 de ... More
Presented by Dr. Toshihiro FUJII on 26 Oct 2015 at 16:30
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The IceCube neutrino observatory features a kilometer-cubed deep detector and a surface component, IceTop, instrumenting the square-kilometer footprint of the detector. IceTop consists of ice-filled tanks equipped with optical sensors capable of detecting charged particles produced in air showers. Besides measuring the cosmic-ray spectrum and composition, IceTop can be used as a veto for IceCube. ... More
Presented by Delia TOSI on 26 Oct 2015 at 15:00
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The gamma-ray energy range from a few hundred keV to a few hundred MeV has remained largely unexplored, mainly due to the challenging nature of the measurements, since the pioneering but limited observations by COMPTEL on the Compton Gamma-Ray Observatory (1991-2000). This energy regime encompasses the transition between thermal and nonthermal processes, and accurate measurements are critical for ... More
Presented by Dr. Jeremy PERKINS on 29 Oct 2015 at 18:10
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We discuss the possible production of ultra-high-energy cosmic rays (UHECRs) in fast winds of active galactic nuclei (AGN). Recent X-ray observations of AGN are revealing the widespread presence of powerful outflows of baryonic material reaching mildly relativistic velocities, in the form of variable, blue-shifted absorption lines of ionized heavy elements. Being discerned in both radio-quiet and ... More
Presented by Dr. Susumu INOUE on 26 Oct 2015 at 18:10
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We present a concept for large-area, low-cost detection of ultra-high energy cosmic rays (UHECRs) with a Fluorescence detector Array of Single-pixel Telescopes (FAST), addressing the requirements for the next generation of UHECR experiments. In the FAST design, a large field of view is covered by a few pixels at the focal plane of a mirror or Fresnel lens. We report first results of a FAST prototy ... More
Presented by Dr. Toshihiro FUJII on 29 Oct 2015 at 15:30
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
We consider a simple extension of the Higgs sector in a Higgs portal dark matter where a real scalar is a candidate for dark matter in the present Universe. This Higgs sector extension allows that its dark matter annihilation suitably explains the observed excess of the gamma-ray flux from the Galactic Center. We identify the parameter region of the model that can fit the gamma-ray excess and sati ... More
Presented by Osamu SETO on 29 Oct 2015 at 18:13
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
H.E.S.S. is a hybrid array of five imaging atmospheric Cherenkov telescopes operating in the very-high-energy (VHE) gamma-ray energy range ~20 GeV to 100 TeV. With its unprecedented sensitivity, broad energy range, fast slew time, and Southern-hemisphere location in Namibia, H.E.S.S. provides an unparalleled, high-quality view of the VHE Galaxy, in a multi-messenger approach that builds on agreeme ... More
Presented by Dr. Ryan CHAVES on 29 Oct 2015 at 14:00
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
We reconsider the model of Minimal Dark Matter (a fermionic, hypercharge-less quintuplet of the EW interactions) and precisely compute its gamma ray signals. We compare them with a number of gamma-ray probes: the galactic halo diffuse measurements, the galactic center line searches and recent dwarf galaxies observations. We find that the original minimal model, whose mass is fixed at 9.4 TeV by th ... More
Presented by Dr. Paolo PANCI on 29 Oct 2015 at 18:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Radiatively inefficient accretion flows (RIAFs) in low-luminosity active galactic nuclei (LLAGNs) have been suggested as cosmic-ray and neutrino sources, which may largely contribute to the observed diffuse neutrino intensity. We show that this scenario naturally predicts hadronic multi-TeV gamma-ray excesses around galactic centers. The protons accelerated in the RIAF in Sagittarius A* (Sgr A*) ... More
Presented by Prof. Yutaka FUJITA on 29 Oct 2015 at 16:55
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
I will present results on the analysis of gamma-ray emission from the recently discovered dwarf galaxy Reticulum II. Using Fermi-LAT data and a suite of background models we quantify the probability that the observed gamma-ray emission is due to background. Taking into account trials factors, we find emission p-values in the range between 9.8x10^-5 and 9.7x10^-3 and conclude that Reticulum II h ... More
Presented by Prof. Savvas KOUSHIAPPAS on 27 Oct 2015 at 17:38
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We discuss scenarios which turn to production of gamma-ray emission within the redback type binary systems containing millisecond pulsar and a low mass stellar companion. The millisecond pulsar can eject relativistic leptons from the inner magnetosphere in the rotation powered stage. These leptons, or after additional re-acceleration, can interact with radiation of companion star. In the accre ... More
Presented by Prof. Wlodek BEDNAREK on 29 Oct 2015 at 17:35
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
In this contribution the H.E.S.S. programs to follow up on multi-wavelength and multi-messenger observations and alerts will be presented. Ongoing activities searching for high-energy gamma-ray emission in coincidence with Gamma Ray Bursts, recent extensions to Fast Radio Bursts and (in the future) gravitational waves are going to be discussed. Furthermore the newly installed H.E.S.S. multi-messe ... More
Presented by Dr. Fabian SCHÜSSLER on 29 Oct 2015 at 15:50
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
The recent claim that gamma-ray excess exists in FERMI data has triggerred many interesting discussions. Here we propose several simple higgs-portal dark matter models for explaining the excess. We also compare various channels using global fit.
Presented by Dr. Yong TANG on 29 Oct 2015 at 17:56
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
gamma-ray astronomy suffers from the sensitivity gap between the energy ranges for which Compton telescopes and pair telescopes are efficient. This blank part of the SED of the cosmic sources that are active at high energy hinders the understanding of their nature. In particular the pi0 bump that is dreamt to be signing the hadronic interactions in the cosmic accelerators that produce the h ... More
Presented by Prof. Denis BERNARD on 29 Oct 2015 at 18:25
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
Fast-spinning newborn pulsars are promising sources of ultrahigh energy cosmic rays (UHECRs). With proper injection abundances, integrated cosmic rays from the extragalactic pulsar population can match UHE observation in all aspects - energy spectrum, chemical composition, and anisotropy. High-energy neutrinos would be produced unavoidably, when accelerated UHECRs travel through the supernova enve ... More
Presented by Ke FANG on 29 Oct 2015 at 18:10
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The origin of high-energy neutrinos detected by the IceCube neutrino telescope is a big mystery of high-energy astrophysics. We propose low-luminosity active galactic nuclei (LLAGNs) as a novel source of the high-energy neutrinos. The radiation inefficient accretion flows (RIAFs) are believed to exist in LLAGNs. The Coulomb collisions inside RIAFs is so inefficient that plasmas naturally have high ... More
Presented by Dr. Shigeo KIMURA on 29 Oct 2015 at 17:55
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Our understanding of high-energy emission from Gamma-Ray Bursts has greatly advanced with observations from the Fermi gamma-ray space telescope. I will review the Fermi observations, with particular emphasis on the surprising detection of both prompt and temporally extended emission at high energies. I will also discuss the prospects for detection of GRBs with the High Altitude Water Cherenkov ( ... More
Presented by Dr. Valerie CONNAUGHTON on 27 Oct 2015 at 14:00
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
VERITAS is an array of four imaging atmospheric Cherenkov telescopes designed to observe gamma-ray emission from astrophysical objects in the energy range from 85 GeV to > 30 TeV. Located at the Fred Lawrence Whipple Observatory in Arizona, VERITAS has operated successfully over seven years with two major upgrades that improved the performance of the array. The scientific goals of VERITAS include ... More
Presented by Nahee PARK on 27 Oct 2015 at 15:13
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
H.E.S.S. is an array of Imaging Atmospheric Cherenkov Telescopes observing the gamma-ray sky beyond ~20 GeV. In the course of the first 10 years of operation, this experiment significantly contributed to the field of ground-based gamma-ray astronomy. In 2012, a fifth telescope was added at the centre of the original array. This large telescope of 28 meters diameter improves the performance of the ... More
Presented by Dr. Aion VIANA on 27 Oct 2015 at 15:36
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
Sources of the 53 high energy neutrino events detected by IceCube with energy between 20 TeV and 2.7 PeV is one of the outstanding puzzles in recent years. Suggestions range from Galactic to extragalactic sources, and from standard model interactions to dark matter decay or annihilation. We perform a statistical analysis of the distribution of these neutrino events and astrophysical sources. Our r ... More
Presented by Dr. REETANJALI MOHARANA on 29 Oct 2015 at 17:10
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
There is significant astrophysical uncertainty in the interpretation of data from dark matter direct detection experiments, due to the poorly known dark matter distribution at the position of the Sun. I will discuss the local dark matter density and velocity distribution of Milky Way-like galaxies obtained from the high-resolution EAGLE hydrodynamical simulations. To make reliable predictions for ... More
Presented by Nassim BOZORGNIA on 27 Oct 2015 at 14:00
Session: Plenary talks
Track: Plenary session
The very high energy gamma-ray astrophysics with Imaging Atmospheric Cherenkov Telescopes is blooming thanks to the excellent performance of the experiments H.E.S.S., MAGIC and VERITAS. Large fraction of the scientific program of these experiments is devoted to observation of active galactic nuclei (such as blazars and radio galaxies) and follow-ups of gamma-ray burst alerts. In this talk I will h ... More
Presented by Dr. Daniel MAZIN on 27 Oct 2015 at 12:00
Session: Plenary Talks
Track: Plenary session
Modern cosmology requires dark matter (DM) to explain the structure of the visible universe. The nature of DM is totally unknown. One attractive candidate put forward by theory is a weakly interacting massive particle (WIMP), which could be a thermal relic of the Big Bang. The supersymmetric extension of the standard model provides one of the major candidates for DM. With this consideration, world ... More
Presented by Shigetaka MORIYAMA on 29 Oct 2015 at 11:00
Session: Plenary Talks
Track: Plenary session
Presented by Prof. Masahiro TESHIMA on 30 Oct 2015 at 11:45
Session: Plenary Talks
Track: Plenary session
Presented by Dr. Samaya NISSANKE on 30 Oct 2015 at 09:15
Session: Plenary Talks
Track: Plenary session
Following the first observation of PeV neutrino events and successful measurements of high energy extraterrestrial neutrino flux in the energy region between a few tens of TeV and PeV significantly above the atmospheric neutrino background flux by IceCube, the field of neutrino astrophysics is becoming more and more active. In this contribution, I summarize the recent experimental results from cos ... More
Presented by Dr. Aya ISHIHARA on 26 Oct 2015 at 10:00
Session: Plenary Talks
Track: Plenary session
Many dark matter (DM) models predict that DM in a broad range of astrophysical settings could annihilate or decay into Standard Model particles at rates that would be detectable by contemporary telescopes and cosmic-ray experiments. I will review the status of indirect DM searches with a special focus on recent experimental and theoretical developments. I will also consider future observations tha ... More
Presented by Dr. Keith BECHTOL on 29 Oct 2015 at 09:30
Session: Plenary Talks
Track: Plenary session
Presented by Dr. Hitoshi MURAYAMA on 29 Oct 2015 at 08:45
Session: Plenary talks
Track: Plenary session
In recent years, direct cosmic-ray detectors reached an unprecedented level of precision, allowing to measure new spectral features deviating from longstanding expectations and extrapolations. In this talk, I will review some main theories trying to explain the latest observations of charged cosmic rays. These ideas range from acceleration and propagation effects to additional contributions from l ... More
Presented by Dr. Antje PUTZE on 26 Oct 2015 at 11:30
Session: Plenary Talks
Track: Plenary session
The search for sharp features in the gamma-ray spectrum is a promising approach to identify a signal from dark matter annihilation over the astrophysical backgrounds. In this talk we review different scenarios leading to sharp gamma-ray spectral features and we discuss the current experiments limits as well as the prospects for detection with future instruments.
Presented by Dr. Alejandro IBARRA on 30 Oct 2015 at 09:45
Session: Plenary Talks
Track: Plenary session
Presented by Dr. Bruno SERFASS on 29 Oct 2015 at 10:00
Session: Plenary Talks
Track: Plenary session
Our knowledge of the extragalactic gamma-ray sky is evolving very rapidly as new data becomes available. I will present recent results on the gamma-ray emission from extragalactic sources based on the latest Fermi-LAT catalogs (3FGL-3LAC and 2FHL), on new large samples of multi-frequency selected gamma-ray and VHE emitting blazars (1WHSP and 2WHSP), and from extensive Monte-Carlo simulations of g ... More
Presented by Dr. Paolo GIOMMI on 27 Oct 2015 at 10:00
Session: Plenary Talks
Track: Plenary session
Presented by Dr. Olaf REIMER on 27 Oct 2015 at 09:30
Session: Plenary talks
Track: Plenary session
The Crab pulsar is one of the youngest pulsars in our galaxy. It exhibits the highest spin-down luminosity among the galactic neutron stars and has been observed from radio to VHE. Fermi/LAT reported a detailed phase-resolved spectrum in 0.1-10 GeV, while VERITAS and MAGIC detected pulsed photons in the double peak and the bridge phases in 25GeV-2TeV. In this talk, I will solve the particle accele ... More
Presented by Dr. Kouichi HIROTANI on 27 Oct 2015 at 11:00
Session: Plenary talks
Track: Plenary session
Energy spectra of cosmic-rays in GeV-TeV region have been directly measured by balloons and in space. Particularly cosmic-ray antiparticles can provide unique opportunity to study fundamental physics such as indirect searches for Dark Matter and understanding of its nature. More than four years after AMS (Alpha Magnetic Spectrometer) start taking data on the ISS (International Space Station), the ... More
Presented by Dr. Sadakazu HAINO on 26 Oct 2015 at 11:00
Type: Oral presentation Session: Plenary talks
Track: Plenary session
The three major ground-based gamma-ray experiments, H.E.S.S., MAGIC and VERITAS have carried out an extensive program of very high energy (VHE) observations of the Universe and revolutionized our view of the VHE gamma-ray sky. Studies at TeV energies are valuable for exploring the underlying energetic particle populations in Galactic systems. Galactic gamma-ray sources include shell-type supe ... More
Presented by Prof. Reshmi MUKHERJEE on 27 Oct 2015 at 11:30
Type: Oral presentation Session: Plenary Talks
Track: Plenary session
The High Altitude Water Cherenkov Observatory (HAWC) is a new and novel TeV gamma-ray detector that was recently completed and began full operation in March 2015. Located on the Sierra Negra volcano, Puebla, Mexico, at an elevation of 4,100m, HAWC is optimized for the detection of gamma rays in the 0.1 - 100~TeV range. It's 2sr field-of-view and >90% duty cycle make HAWC an ideal instrument for su ... More
Presented by Dr. Andrew SMITH on 29 Oct 2015 at 09:00
Type: Oral presentation Session: Plenary Talks
Track: Plenary session
The presence of dark matter in spiral galaxies was inferred long ago by measuring the rotational speed of the gas across each galaxy. Applying the same technique to the Milky Way, a spiral itself, is much more challenging due to our peculiar position and thus the Galactic distribution of dark matter remains poorly constrained to this day. In this talk, I shall introduce two important developments ... More
Presented by Dr. Miguel PATO on 30 Oct 2015 at 10:45
Session: Plenary talks
Track: Plenary session
Presented by Dr. Masato SHIOZAWA on 26 Oct 2015 at 12:00
Type: Oral presentation Session: Plenary Talks
Track: Plenary session
IceCube's discovery of a diffuse flux of high-energy astrophysical neutrinos has vitalized the emerging field of neutrino astronomy, but many questions remain unanswered. The source populations remain unidentified, and other expected astrophysical high-energy neutrinos, such as those from the GZK process, remain undetected. Details of the energy spectrum and flavor composition also are yet to be ... More
Presented by Dr. John KELLEY on 30 Oct 2015 at 13:45
Type: Oral presentation Session: Plenary Talks
Track: Plenary session
The Telescope Array (TA) experiment is located in the western desert of Utah, USA, and observes ultra high energy cosmic rays in the northern hemisphere. The experiment observes cosmic ray air shower at energies > 1 EeV using the fluorescence telescopes and the surface detectors. From first 5 year data, an anisotropy called "Hot spot" in arrival direction of cosmic ray was found at energy >57EeV. ... More
Presented by Dr. Toshiyuki NONAKA on 29 Oct 2015 at 11:30
Type: Oral presentation Session: Plenary Talks
Track: Plenary session
The CALorimetric Electron Telescope (CALET) space experiment, which had been developed by Japan in collaboration with Italy and the United States, is a high-energy astroparticle physics mission on the International Space Station (ISS). The primary goals of the CALET mission include investigating possible nearby sources of high energy electrons, studying the details of galactic particle propagation ... More
Presented by Prof. Shoji TORII on 30 Oct 2015 at 11:15
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The KM3NeT Collaboration is currently constructing the first phase of a next-generation neutrino telescope on two sites in the Mediterranean Sea: KM3NeT-FR near Toulon (France), and KM3NeT-IT near Capo Passero in Sicily (Italy). Each site will host a three-dimensional array of thousands of photosensors that will detect the Cherenkov light resulting from neutrino interactions in the vicinity o ... More
Presented by Veronique VAN ELEWYCK on 26 Oct 2015 at 14:00
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We present the lens manufacturing for the near future missions of ultra high energy cosmic rays. The EUSO ultra long duration balloon flight mission and the K-EUSO project have been planed. The balloon optics is compose of two Fresnel lenses and a diffractive lens. The K-EUSO optics is composed of a primary aspherical mirror and a Fresnel lens as a corrector lens. RIKEN will provide Fresnel lenses ... More
Presented by Dr. Yoshiyuki TAKIZAWA on 29 Oct 2015 at 14:55
Session: Dark Matter
Track: Dark matter searches (direct and indirect)
The EDELWEISS-III collaboration is operating an experiment for the direct detection of WIMP dark matter in the low radioactivity environment of the Modane Underground Laboratory. It consists of 36 advanced "FID" germanium detectors operating at 18 mK in a dilution refrigerator in order to identify eventual rare nuclear recoils induced by elastic scattering of WIMPs from our Galactic halo. After a ... More
Presented by Dr. Eric ARMENGAUD on 29 Oct 2015 at 14:17
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
There are several types of Galactic sources that can potentially accelerate charged particles up to GeV and TeV energies. These accelerated particles can produce Very High Energy (VHE) gamma-ray emission through different processes, for example inverse Compton scattering of ambient photon fields by accelerated electrons. We study various transient and variable stellar objects in the VHE regime us ... More
Presented by Daniela HADASCH on 29 Oct 2015 at 14:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The blazar QSO B0218+357 is the most distant AGN (z=0.944) detected so far in the TeV range. It is gravitationally lensed by the galaxy B0218+357G (z=0.68). Very-high-energy (VHE) gamma-ray emission from QSO B0218+357 was detected in July 2014 with the MAGIC telescopes, by measuring the time-delayed image of the flare, detected earlier by FERMI in the GeV range. Its emission enables the study of t ... More
Presented by Prof. Dijana DOMINIS PRESTER on 26 Oct 2015 at 14:45
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Very-high-energy (VHE, E > 100 GeV) gamma-ray emission from the very distant flat spectrum radio quasar PKS 1441+25 (z = 0.940) was detected in April 2015 with the MAGIC telescopes. Aside from the gravitationally lensed VHE blazar QSO B0218+357 (z = 0.944), also detected by MAGIC, PKS 1441+25 is the most distant VHE blazar detected to date. The VHE detection occurred in April 2015 during enhanced ... More
Presented by Mr. Miguel NIEVAS-ROSILLO on 26 Oct 2015 at 15:15
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
1ES 1011+496 is a blazar located at a redshift z=0.212, revealed as a very-high-energy gamma-ray emitter by the MAGIC telescopes in 2007. In February 2014 the source underwent an unprecedented flaring episode, reaching a peak flux of almost 14 times the flux measured at the time of discovery, before returning to its low state. The MAGIC telescopes observed the source for a total of 17 nights betwe ... More
Presented by Dr. Abelardo MORALEJO OLAIZOLA on 26 Oct 2015 at 16:55
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The key measurement for any experiment which aims to the observe the elusive Ultra High Energy Cosmic Rays (UHECR) from space is related to the UV background in Earth's atmosphere and at the surface. In view of the planned missions (KLYPVE/K-EUSO, JEM-EUSO) bound for the International Space Station (ISS), a small, compact UV telescope, Mini-EUSO, with the aim to the study the UV night emissions fr ... More
Presented by Dr. Oscar LARSSON on 29 Oct 2015 at 15:45
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
The one-point function (i.e., the isotropic flux distribution) is a complementary method to (anisotropic) two-point correlations in searches for a gamma-ray dark matter annihilation signature. Using analytical models of structure formation and dark matter halo properties, we compute the gamma-ray flux distribution due to annihilations in extragalactic dark matter halos, as it would be observed by ... More
Presented by Mr. Michael FEYEREISEN on 27 Oct 2015 at 17:55
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
I review various scenarios for the origin of high-energy cosmic neutrinos, and show how multi-messenger data can be utilized to constrain the models. I discuss the present implications and prospects for the future observation.
Presented by Prof. Kohta MURASE on 26 Oct 2015 at 14:40
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The blazar Mrk 421 is one of the closest and brightest extragalactic very high energy (VHE, >100 GeV) gamma-ray emitters, and hence one of the VHE objects that we can study best. Since 2009, Mrk 421 is yearly observed during 6 months with more than 25 instruments in the framework of broadband multifrequency campaigns. During April 2013, Mrk421 underwent unprecedented flaring activity in many wav ... More
Presented by Mr. Francesco BORRACCI on 26 Oct 2015 at 17:43
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Fermi bubbles at the Galactic center have been imaged in sub-TeV gamma rays by the Fermi-Large Area Telescope and might have been detected in 0.3-1 PeV neutrinos by the IceCube Neutrino Observatory. A hadronic model, involving cosmic-ray interactions in the bubble volumes, can account for both gamma-ray and neutrino observations but is far from being confirmed due to low neutrino statistics. W ... More
Presented by Prof. Soebur RAZZAQUE on 27 Oct 2015 at 17:35
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Several compact binary systems appeared to have spectral energy distributions that peak is gamma-ray energy band. Almost all these sources have been detected in the high energy and very high energy regimes with Fermi/LAT and ground based Cherenkov detectors, respectively. Detection of very high energy photons from these compact sources implies operation of a very efficient particle accelerato ... More
Presented by Mr. Dmitriy KHANGULYAN on 29 Oct 2015 at 15:10
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We show that the Fermi Bubbles and the Galactic haze are naturally interpreted as inverse-Compton and synchrotron emission from the same spectrum of cooling cosmic ray electrons. This avoids the ad-hoc spectral features and superfluous acceleration mechanisms typically assumed. The model implies that the bubbles originated 2-3 Myr ago, the mean magnetic field in the haze region is ~3\muG, and the ... More
Presented by Dr. Ilya GURWICH on 27 Oct 2015 at 18:05
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
Acceleration of 's and 's modi es the flavor ratio at Earth (at astrophysical sources) of neutrinos produced by pion decay, nu_e : nu_mu : nu_tau , from 1 : 1 : 1 (1 : 2 : 0) to 1 : 1:8 : 1:8 (0 : 1 : 0) at high energy, because pions decay more than muons during secondary-acceleration. The neutrino spectrum accompanies a flat excess, differently from the case of energy losses. With the ... More
Presented by Dr. Norita KAWANAKA on 29 Oct 2015 at 17:40
Session: Dark Matter
Track: Dark matter searches (direct and indirect)
The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment aims at the direct detection of WIMPs. The recent Dark Matter run was operated for 2 years with a total target mass of 5kg. With respect to previous measuring campaigns the intrinsic radiopurity of CaWO4 crystals and the capability to reject recoil events from alpha surface contamination has been significantly im ... More
Presented by Dr. Raimund STRAUSS on 29 Oct 2015 at 15:25
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
Two LHC experiments, ATLAS and CMS restarted their operations so called Run-2 from June this year. The center of mass energy is increased to 13 TeV, with which the significant enhancement in sensitivity is anticipated for the new physics. The talk will briefly review the Run-1 results and will discuss the prospects for the Run-2. The status and the early results from the Run-2 will be also sh ... More
Presented by Dr. Osamu JINNOUCHI on 26 Oct 2015 at 16:30
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
The formation, electromagnetic structure, and the injection of suprathermal particles into a Fermi-type acceleration at collisionless shocks constitute important problems of high-energy astrophysics. We report on recent particle-in-cell studies of high Mach-number nonrelativistic perpendicular shocks in applications to young supernova remnants. We discuss a nonlinear shock structure mediated by We ... More
Presented by Prof. Jacek NIEMIEC on 27 Oct 2015 at 15:45
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
IceCube is a cubic-kilometer neutrino observatory buried deep in the ice sheet at the geographic South Pole. The data from its first few years of operation have revealed an excess of high-energy neutrino events in multiple detection channels that is incompatible with purely atmospheric origins, which we interpret as evidence for a flux of neutrinos from unresolved astrophysical sources. At th ... More
Presented by Dr. Jakob VAN SANTEN on 29 Oct 2015 at 16:30
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
An updated analysis on the mu --> e + gamma was performed in a new class of non-sterile electroweak scale right-handed neutrino models with a A_4 symmetry in the neutrino sector. This class of models provide an interesting link between charged lepton flavor violating processes to the physics of neutrino sector. Constraints from the current limit and projected sensitivity from MEG experiment are st ... More
Presented by Prof. Tzu-Chiang YUAN on 26 Oct 2015 at 15:25
Presented by Prof. Gianfranco BERTONE on 26 Oct 2015 at 09:40
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
Large Hadron Collider forward (LHCf) experiment was motivated to study the hadronic interaction relevant to the air shower development at the very forward of the LHC interaction point. LHCf has measured particle production at LHC 0.9, 2.76, 7 and 13TeV proton-proton collisions and 5TeV proton-Lead collisions. LHCf has tested existing hadronic interaction models and provides strong constraints t ... More
Presented by Takashi SAKO on 26 Oct 2015 at 17:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
X-ray observations of active galactic nuclei (AGN) are revealing the widespread existence of powerful, baryonic outflows reaching mildly relativistic velocities, seen as variable, blue-shifted absorption lines of ionized heavy elements, in both radio-quiet and radio-loud objects. Sometimes called ultra-fast outflows (UFOs), they are plausibly interpreted as winds driven by the accretion disk and m ... More
Presented by Dr. Susumu INOUE on 26 Oct 2015 at 15:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Gamma-rays give us a view on the acceleration some of the most energetic particles in the universe. These particles are usually thought to be accelerated in (relativistic) shocks. However, with the advances in Particle In Cell simulations over the past years it became clear that magnetic reconnection is also a compelling alternative. In this talk, I will discuss what gamma-ray observations can tel ... More
Presented by Dr. Rolf BUEHLER on 27 Oct 2015 at 16:30
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
The Pamela spectrometer was launched in 2006 from the cosmodrome of Baikonur, Kazakistan, on board the Russian satellite Resurs-DK1. Since then, it has been collecting cosmic rays from its 70 degrees inclination, 600 km altitude polar orbit. This orbit allows to sample particles of trapped, semi-trapped nature in the Earth geomagnetosphere, of solar origin (emitted in solar particle events), of g ... More
Presented by Dr. Marco CASOLINO on 27 Oct 2015 at 14:40
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
DRAGON is a public software package developed to study CR propagation in the Galaxy. It includes diffusive/advective transport, as well as reacceleration and energy losses, for most of the nuclear and lepton species. Each species can originate from astrophysical sources (e.g., SNR, Pulsars) or from DM annihilations/decays in the halo, making the code very suitable both for studying Galactic high- ... More
Presented by Dr. Carmelo EVOLI on 27 Oct 2015 at 16:55
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
The nature of dark matter (DM) is an open issue of modern physics. Cosmological considerations and observational evidences indicate a behaviour beyond the Standard Model for optimal dark matter particle candidates. The non-baryonic dark matter is compatible with a gas of cold and weakly interacting massive particles (WIMPs) expected to have a mass in the range between O(10)GeV and O(100)TeV. Indir ... More
Presented by Dr. Saverio LOMBARDI on 27 Oct 2015 at 18:29
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
Dark matter can excite the xenon isotopes 129Xe and 131Xe through a spin dependent interaction. The excited isotopes quickly decay giving a 40 keV and 80 keV photon, respectively. This signal is very distinct from the usual signal from elastically scattering dark matter and, if discovered, would provide clear evidence against the usual spin independent interaction. I discuss the prospects of disco ... More
Presented by Dr. Christopher MCCABE on 27 Oct 2015 at 14:51
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
One of the most promising way to detect dark matter is to look for its annihilation or decay products among cosmic-rays. Recently, more and more interesting results are reported by measurements of cosmic-rays from various kinds of targets such as the milky way galaxy, dwarf spheroidal galaxies, cluster galaxies, etc. Among them, dwarf spheroidal galaxy is one of the nearest, dark matter dominated ... More
Presented by Mr. Koji ICHIKAWA on 27 Oct 2015 at 17:21
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Pulsars and their synchrotron nebulae have been extensively observed in the gamma-ray energy band only in the last 10 years. With the advent of the Fermi satellite the number of known gamma-ray emitting pulsars has increased by one order of magnitude, touching the 150 mark. On the other hand, the last generation of imaging Cherenkov telescopes proved that the pulsar wind nebulae are the most popul ... More
Presented by Dr. Roberta ZANIN on 27 Oct 2015 at 14:25
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Vela pulsar (PSR J0835 − 4510) is the brightest persistent source in the high-energy γ-ray sky. It is a relatively near, young and energetic rotation-powered pulsar. Vela was a key target for the High Energy Stereoscopic System phase II array (H.E.S.S. II). Observations were carried out following a hint of pulsed emission above 20GeV seen using Fermi-LAT data. In this talk we present detail ... More
Presented by Bronislaw RUDAK on 29 Oct 2015 at 14:20
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Fermi-LAT measurements of the diffuse Galactic gamma-ray emission reveal a hardening of the cosmic-ray (CR) spectrum with decreasing Galactocentric radius. This result can be the signature of different CR trasport properties in the inner Galaxy, and in particular a harder rigidity scaling of the diffusion coefficient. We model this effect with DRAGON and we provide a good description of both ... More
Presented by Dr. Daniele GAGGERO on 27 Oct 2015 at 17:20
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
In the standard model (SM), Higgs lepton-flavor-violating (LFV) decay is absent and thus it is a good probe to new physics. In this article we study a type of new physics that could lead to large Higgs LFV decay, i.e., leptophlic dark matter (DM) specified by the particle property of DM (a Majorana fermion) and DM-SM mediators (scalar leptons). Different than other similar setups, here we introduc ... More
Presented by zhaofeng KANG on 29 Oct 2015 at 18:47
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
In the last decade significant progress was made regarding the radio detection of cosmic-ray air showers. Mainly at MHz frequencies, air showers emit a coherent radio pulse in the forward direction, which exceeds the galactic radio background at an energy threshold of roughly 100 PeV. The dominant emission mechanism is the deflection of electrons and positrons in the shower by the geomagnetic fiel ... More
Presented by Dr. Frank SCHRÖDER on 29 Oct 2015 at 15:10
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
MAGIC (Major Atmospheric Gamma Imaging Cherenkov) is a system of two imaging atmospheric Cherenkov telescopes located at the Canary island of La Palma. The telescopes are performing observations of gamma rays with energies between 50 GeV and tens of TeV. In 2014 MAGIC celebrated its 10th anniversary of scientific operations. In this talk I will present the recent highlights of the observation ... More
Presented by Julian SITAREK on 27 Oct 2015 at 14:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
By upgrading the H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes with a fifth, 28-m diameter telescope, the sensitivity of H.E.S.S. towards low gamma-ray energies has been extended to energies below 100 GeV. This allows studies particularly of distant Active Galactic Nuclei (AGN) with soft gamma-ray spectra. Results of observations with the five-telescope array will be discussed, includ ... More
Presented by Dr. Robert WAGNER on 26 Oct 2015 at 14:25
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The ANTARES detector, located in the deep Mediterranean sea off the coast of Toulon (France), is the first deep-sea neutrino telescope and has been running in its final configuration since 2008. It consists of a 3D array of 885 photomultipliers distributed on 12 lines anchored on the sea bed, that detect the Cherenkov light induced by upward-going charged leptons produced by neutrino interactions ... More
Presented by Mr. Rodrigo GRACIA RUIZ on 29 Oct 2015 at 16:50
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
Recent results from the Tibet ASγ experiment will be reported. The presentation will be focused mainly on the high-energy cosmic-ray anisotropy and the research on the Sun’s magnetic field by means of the Sun’s shadow observed by the Tibet air shower array.
Presented by Dr. Takashi SAKO on 26 Oct 2015 at 17:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The blazars high-energy emission is believed to be produced in the jets, powered by their central supermassive black holes. At the same time the location of the emission region within the jet is presently uncertain - mainly due to its extremely small angular size, far beyond the capabilities of the existing gamma-ray instruments. However, in the rare case of the gravitationally lensed blazars, it ... More
Presented by Dr. Ievgen VOVK on 26 Oct 2015 at 15:00
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The Askaryan Radio Array is a neutrino radio detector array being built at the south pole. It aims at the observation of cosmic ultra high energy neutrino (E > 10PeV) via the coherent radio waves emitted from the charge excess in the cascade induced after the interaction of the neutrinos in ice. The radio signal expected by ARA rely mostly on the simulation of the emission process ... More
Presented by Mr. Romain GAIOR on 26 Oct 2015 at 15:30
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
In my talk I will review the case of scalar dark matter model in which case the dark matter candidate couples to the Standard Model (SM) fermions through Yukawa interactions involving a new vector-like fermion. The latter models are already know to give rise to particularly interesting gamma ray signals when the Yukawa coupling is restricted to leptons. In my talk, I will present our latest result ... More
Presented by Dr. Laura LOPEZ HONOREZ on 26 Oct 2015 at 17:05
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
XENON100 is currently one of the world leading dark matter direct detection experiments using a dual phase Xenon time projection chamber (TPC). The XENON100 experiment has accumulated more than one year of dark matter search data since February 2011 at a background level of 5.3 events/(keV*tonne*day). This data allows to test the interpretation of the long standing DAMA/LIBRA annual modulation obs ... More
Presented by Mr. Fei GAO on 29 Oct 2015 at 14:00
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
Many of the astrophysical sources and violent phenomena observed in our Universe are potential emitters of gravitational waves and high energy neutrinos. Both these probes are cosmic messengers that may escape much denser media than photons. LIGO and Virgo scientific collaborations have carried out joint searches for gravitational waves and high energy neutrinos from IceCube and ANTARES neutrino ... More
Presented by Dr. Di Palma IRENE on 29 Oct 2015 at 18:25
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
We are searching the Singlet Majorana dark matter (DM) by using constraints from relic density, colliders (LHC and LEP), DM direct detection, and DM indirect detection. By the means of effective field theory (EFT), we write down several kinds of higher dimensional operators and show the allowed parameter space by current experiments in DM mass and cut-off scale plane. Furthermore, we also try to e ... More
Presented by Dr. YUE-LIN SMING TSAI on 26 Oct 2015 at 17:22
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Ground-based gamma-ray astronomy is still tackling a major problem: background. Reconstruction techniques exist to distinguish most of the background of hadrons but an irreducible background of electrons and gamma-like protons still remain. I present here a new technique making use of direct Cherenkov light and air shower development that provides a way to efficiently distinguish between electrons ... More
Presented by Ms. Tanya EDWARDS on 26 Oct 2015 at 18:13
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We present recent results on the high-frequency-peaked BL Lac object Markarian 501 derived from extensive multi-wavelength campaigns in the years 2009, 2012 and 2013. The blazar is located in our extragalactic neighborhood (z=0.034), which reduces spectral uncertainties due to absorption effects of the Extragalactic Background Light and allows for significant detections on sub-hour timescales, thu ... More
Presented by Dr. Marlene DOERT on 26 Oct 2015 at 17:58
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We propose a model to explain the ultra-bright GeV gamma-ray flares observed from the blazar 3C454.3. The model is based on the concept of a relativistic jet interacting with compact gas condensations produced when a star (red giant) crosses the jet close to the central black hole. The study includes an analytical treatment of the evolution of the envelop lost by the star within the jet, and calcu ... More
Presented by Dr. Maxim BARKOV on 26 Oct 2015 at 17:28
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The Askaryan Radio Array (ARA) is an ultra-high energy (>100 PeV) cosmic neutrino detector which is in phased construction near the South Pole. ARA searches for radio Cherenkov-like emission from particle cascades induced by neutrino interactions in the ice using radio frequency antennas (~150-800MHz) deployed at a design depth of 200m in the Antarctic ice. A prototype ARA Testbed station was depl ... More
Presented by Dr. Michael DUVERNOIS on 26 Oct 2015 at 15:15
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Multi-wavelength observations of blazars have revealed curved feature in photon spectrum. Moreover, in some cases, the required electron spectral index at injection becomes harder than 2. In order to reproduce such a curved electron spectrum, we discuss the second order Fermi acceleration by turbulence in the jet. Here, we focus on the time-dependent effects of the electron acceleration and inject ... More
Presented by Dr. Katsuaki ASANO on 26 Oct 2015 at 15:45
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
Using gamma-ray data from the Fermi Large Area Telescope, various groups have identified an excess emission in the inner Galaxy centred around energies of a few GeV. This excess resembles remarkably well a signal from dark matter annihilation. One of the most plausible astrophysical interpretations is in terms of the combined emission from an undetected population of dim gamma-ray sources. In part ... More
Presented by Mr. Richard BARTELS on 27 Oct 2015 at 16:30
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
KLYPVE/K-EUSO is a detector designed to detect and study Ultra-High-Energy Cosmic Rays (UHECR) from space. It is Russian mission to be located on the International Space Station. It consists of a 3.6m diameter mirror which reflects UV light from UHECR on a Fresnel lens, in turn focusing the signal on a 1.4m focal surface. The focal surface is made up of 1872, 64 channel Hamamatsu PMTs for a total ... More
Presented by Dr. Marco CASOLINO on 29 Oct 2015 at 14:00
Session: Closing Cermony
Track: Plenary session
Presented by Dr. Alex KUSENKO on 30 Oct 2015 at 14:15
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We study the chemical composition of Ultra-High Energy Cosmic Rays (UHECRs) primarily using the Xmax technique. The reconstruction techniques use events either seen by two of the TA fluorescence detectors (stereo mode), or by one fluorescence detector, and one fluorescence detector and the TA surface detector (hybrid mode). We compare the observed Xmax distributions to those of shower Monte Carlo ... More
Presented by Dr. Daisuke IKEDA on 26 Oct 2015 at 16:50
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We present the results of searching for large- and small-scale anisotropy of ultra-high energy cosmic rays (UHECRs) observed for 7 years by the surface detectors of the Telescope Array experiment. The Telescope Array experiment accumulated the largest UHECR data set in the Northern hemisphere. At small angular scales we examine the data for clustering of events and correlations with various classe ... More
Presented by Dr. Eiji KIDO on 26 Oct 2015 at 17:10
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
The feasibility of the detection of TeV gamma-rays from astrophysical objects has been carried out using the INO-ICAL detector. The detection of very high energy gamma-rays has been followed by the detection of down going muons produced through the electromagnetic showers initiated by gamma-ray in the atmosphere. As the produced muons through this process are of same charge ratio, they might be ... More
Presented by Dr. REETANJALI MOHARANA on 26 Oct 2015 at 15:45
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
The halo dark matter (DM) can be gravitationally captured by the Sun. For self-interacting DM (SIDM), we show that the number of DM trapped inside the Sun remains unsuppressed even if the DM-nucleon cross section is negligible. We consider a SIDM model where *U*(1) gauge symmetry is introduced to account for the DM self-interaction. Such a model naturally leads to isospin violation for DM-nuc ... More
Presented by Dr. Chian-Shu CHEN on 27 Oct 2015 at 15:25
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Recent analyses of Fermi Large Area Telescope data show an extended GeV γ-ray excess on top of the expected diffuse background in the Galactic center region, which can be explained by annihilating dark matter (DM) or a population of millisecond pulsars (MSPs). We propose observations of very high energy (VHE) γ-rays to distinguish the MSP scenario from the DM scenario. GeV γ-ray MSPs should rel ... More
Presented by Dr. Kunihito IOKA on 29 Oct 2015 at 17:15
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
In the framework of the international Cherenkov Telescope Array (CTA) observatory, the Italian National Institute for Astrophysics (INAF) has developed a large field-of-view (9.6 degrees), dual-mirror, small-sized, end-to-end telescope (ASTRI SST-2M). This prototype has been installed at Mt. Etna (Italy) on September 2014, and it is currently undergoing engineering tests. Soon after the scientific ... More
Presented by Dr. Saverio LOMBARDI on 26 Oct 2015 at 18:28
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
Whether or not an exotic component, as the fugitive Dark Matter, contributes to the observed high-energy CR fluxes, is one of the most important open problem in Cosmology. Charged CRs play a key role in this context, since Weakly Interacting Massive Particle annihilations or decays can be a copious source of antimatter in our Galaxy, and the local CR fluxes from conventional astrophysical sources ... More
Presented by Dr. Carmelo EVOLI on 29 Oct 2015 at 16:30
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
EUSO-TA is an on-ground prototype of an orbital Ultra High Energy Cosmic Rays detection mission - JEM-EUSO. It consists of two 1 m2 Fresnel lenses and a 2304 pixel focal surface, with resulting field of view of about 10.5x10.5 degrees, and has been working on Telescope Array site in Black Rock Mesa, Utah, USA since the end of February 2015. We show here first observations of calibration sources su ... More
Presented by Dr. Lech PIOTROWSI on 29 Oct 2015 at 14:20
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
Very high energy (E>100 GeV) cosmic electrons and positrons reaching Earth from beyond the solar system are important tracers of recent energetic events in our galactic neighbourhood. Rapid energy losses due to synchrotron radiation and inverse Compton processes result in typical lifetimes of these energetic particles of less than 10^5 years. Their mean free path in the Galaxy is O(1-2) Kpc. Measu ... More
Presented by Mrs. Kathrin MALLOT on 27 Oct 2015 at 15:00
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
Observations of the ARCADE-2 and other telescopes have reported a significant isotropic emission spanning from 22 MHz to 10 GHz. The intensity of this signal significantly exceeds the expected contribution from known astrophysical sources, and the distribution of the signal is suggested to be unusually smooth compared to emission which traces large scale structure. In this talk, we investigate the ... More
Presented by Ke FANG on 27 Oct 2015 at 15:42
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
A spatially extended excess of gamma rays collected by the Fermi-LAT from the inner region of the Milky Way has been discovered by different groups and with increasingly sophisticated techniques of data analysis. I will review the characterization of spectral and morphological properties of the excess when variations of the Galactic diffuse emission are properly taken into account. Recently, there ... More
Presented by Dr. Francesca CALORE on 27 Oct 2015 at 17:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We present the results from the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescope of the search for TeV variability in the very high energy (VHE) gamma ray regime performed in the years 2012-2015 during the pericenter passage of the G2 gas cloud. This gas cloud orbits the Galactic Center (GC) on a highly eccentric trajectory with a pericenter distance of only a few thousand Schwarzschild ... More
Presented by Dr. Christian FRUCK on 29 Oct 2015 at 14:35
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Mopra Southern Galactic Plane molecular gas survey is the next generation CO survey of the distribution and dynamics of the molecular gas along the southern galactic plane. Being conducted with 0.6 arcmin and 0.1 km/s resolution, it provides an order of magnitude improvement in both spatial and spectral resolution over the Dame et al 2001 survey, currently our standard source of reference on ... More
Presented by Prof. Michael BURTON on 29 Oct 2015 at 17:55
Session: Dark Matter
Track: Dark matter searches (direct and indirect)
PandaX is a dark matter direct detection experiment with xenon located in the China Jinping Laboratory. The collaboration was established in 2009. It's first stage, PandaX-I, started to take data in May, 2014 and stopped running in the end of Oct, 2014. Its first dark matter searching results based on 17.4 live days of data was released in Aug 2014,and disfavor all previously claimed possible dark ... More
Presented by Dr. Xun CHEN on 29 Oct 2015 at 14:34
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The Telescope Array (TA) collaboration has reported a hotspot of 19 ultrahigh-energy cosmic rays (UHECRs), offering an opportunity to study their origin. Using a universal model with one source and energy-dependent magnetic deections, we show that the distribution of the TA hotspot events is consistent with a single source hypothesis, and that the chance probability of this distribution appearing ... More
Presented by Dr. Shigehiro NAGATAKI on 26 Oct 2015 at 18:30
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
VERITAS, an array of atmospheric Cherenkov telescopes is sensitive to VHE gamma rays in the 85 GeV-30 TeV energy range. VERITAS has a wide scientific reach including observations of supernova remnants, pulsars, pulsar wind nebulae, active galactic nuclei, among others. This presentation will focus on recent developments of the various astroparticle science topics by members of the VERITAS collabor ... More
Presented by Dr. Ben ZITZER on 27 Oct 2015 at 18:12
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The photo-detector module (PDM) of the EUSO is composed of 36 Hamamatsu multi-anode photomultipliers (64 channels per tube), and 36 photon counting readout ASICs, for a total of 2304 channels. We present the calibration of the detection efficiency of the PDM.
Presented by Dr. Yoshiya KAWASAKI on 29 Oct 2015 at 14:40
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
One of the good candidates for cold dark matter is the lightest Kaluza-Klein particle (LKP),which produce electrons and positrons by pair annihilation in the Galactic halo. The directions of electrons and positrons are randomized by the Galactic magnetic field, and the energy is reduced by some energy loss mechanisms, when the charged particles propagate in the Universe. We calculate the ob ... More
Presented by Mr. Satoshi TSUCHIDA on 29 Oct 2015 at 17:39
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Above tens of GeV, gamma-ray observations with the Fermi Large Area Telescope (LAT) are often dominated by statistical uncertainties due to the low source flux and the limited acceptance. The newly released Pass 8 analysis extended the acceptance of Fermi-LAT to ~ 2.5 m^2 sr over 100 GeV, and made effective an event class that can improve the acceptance at these very high gamma-ray energies: the ... More
Presented by Mr. Mitsunari TAKAHASHI on 29 Oct 2015 at 18:40
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
Using a LHAASO wide field of view Cherenkov telescope and the ARGO-YBJ resistive plate chamber array as 4300m a.s.l., the energy spectrum of cosmic hydrogen and helium nuclei (H&He) between 100 TeV and 3 PeV is measured. A clear knee feature is observed around 630 TeV in the spectrum with an energy resolution of about 25%. Below 300 TeV, the data from direct charge measurements provide rather prec ... More
Presented by Dr. Zhen CAO on 27 Oct 2015 at 14:00
Type: Oral presentation Session: Neutrinos
Track: Neutrino physics
IceCube has confirmed the existence of the long-sought high-energy astrophysical neutrinos. Recently, the flavor composition of the diffuse flux, that is, the proportion of electron-, muon-, and tau-flavor in it, was measured for the first time. This rich observable can reveal information about physical conditions in the production, propagation, and detection of neutrinos, including whether there ... More
Presented by Dr. Mauricio BUSTAMANTE on 26 Oct 2015 at 14:20
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Very High Energy (VHE) emission from the Galactic Center Ridge was revealed by H.E.S.S. in 2006, after subtraction of the two bright point sources HESS J1745-290 possibly associated with Sgr A*, and HESS J1747-281 associated with the composite supernova remnant G0.9+0.1. The hard spectrum of the Ridge emission and its spatial correlation with the local gas density suggest that the emission is ... More
Presented by Dr. Anne LEMIÈRE on 27 Oct 2015 at 18:20
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
There is a striking evidence for a roughly spherical-symmetric diffuse gamma-ray signal peaked in the Galactic Center (GC) region, extended up to several degrees off the GC. Here we critically review the main points regarding the derivation of this signal, characterized by means of the template-fitting method. In particular we focus our attention on the usual Inverse Compton (IC) component adopt ... More
Presented by Dr. Mauro VALLI on 27 Oct 2015 at 16:47
Type: Oral presentation Session: Plenary Talks
Track: Ultra High Energy Cosmic Rays
The Pierre Auger Observatory has been designed to investigate the origin and nature of Ultra High Energy Cosmic rays with energies from 1017 to 1020 eV. We will review some seletected recent results obtained from data of the Pierre Auger Observatory and discuss the implication of these results for assembling a consistent description of the composition, origin and propagation of cosmic rays. We wil ... More
Presented by Mrs. isabelle LHENRY-YVON on 29 Oct 2015 at 12:00
Type: Oral presentation Session: Dark Matter
Track: Dark matter searches (direct and indirect)
I will give an update on GAMBIT, the Global And Modular BSM Inference Tool. GAMBIT is a flexible, modular, massively parallel new framework for carrying out global fits to essentially any BSM theory. First results from GAMBIT will incorporate direct, indirect, solar and relic density searches for dark matter, limits on production of new particles from the LHC and LEP, complete flavour constraint ... More
Presented by Pat SCOTT, ON BEHALF OF THE GAMBIT COLLABORATION on 29 Oct 2015 at 17:05
Type: Oral presentation Session: Dark Matter
Track: Dark matter: Physics and Cosmology
The arguably most simple model for WIMP dark matter is a scalar singlet that couples to the Standard Model sector via the Higgs portal. It is a simple example for beyond-the-Standard Model (BSM) physics, and can be tested with collider, direct, indirect and cosmological probes. In this talk, I will present the first analysis results for the scalar singlet dark matter model that we obtained with ... More
Presented by Dr. Christoph WENIGER on 29 Oct 2015 at 17:22
Type: Oral presentation Session: Welcome & Information
Track: Plenary session
Welcome to TeV Particle Astrophysics 2015. This is the 10th edition of TeVPA in Kashiwa, near Tokyo. This 5-day conference aims to provide the stage for the most recent advances in the booming field of Astroparticle Physics, bringing leading members of the scientific communities that are contributing to its success.
Presented by Prof. Masahiro TESHIMA on 26 Oct 2015 at 09:50
Presented by Prof. Takaaki KAJITA on 26 Oct 2015 at 09:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Diffusive shock acceleration (DSA), a well-developed theory of the acceleration process at work in supernova remnants (SNRs), lays the foundation for the SNR paradigm of the CR origin, though key problems are yet to be solved. Determining the acceleration efficiency is one of the key issues, where the term “acceleration efficiency” carries two different meanings; one is related to the maximum ... More
Presented by Dr. Yasunobu UCHIYAMA on 29 Oct 2015 at 16:30