“LIGO : Past, Present and Future”: 山本博章 (Caltech)


Number R2-7
 Date Decenber 21, 2020 13:30-15:00
 PlaceZoom開催: https://zoom.us/j/91752901684?pwd=N0JVUE1FaUhiSXVqdzk4OEdOSVFoUT09
Speaker Dr. Hiroaki Yamamoto (Caltech)
 Title“”LIGO : Past, Present and Future””
 AbstractAfter one hundred years since the prediction of the gravitational wave in the theory of general relativity by A. Einstein, the tiny ripple of the space was finally detected by LIGO, Laser Interferometer Gravitational-Wave Observatory in US, on September 14, 2015, which was radiated by a merger of black holes. The GW signal from a merger of binary neutron stars was detected on August 17, 2017, together with very interesting EM signals by many EM observatories. After spending a year and half to improve the sensitivity, a new observation run started on April 1, 2019 until March 27, 2020. With the improved sensitivity, GW signals are detected almost one per week. Several signal candidates from neutron star mergers and one from a neutron start – black hole merger were detected in one year’s run. The signal includes GW190521, the heftiest merger producing a 147 solar mass black hole and GW190814, observation of a mystery object of 2.6 solar mass in mass gap. This talk will cover continuous effects toward the discovery of the GW signals in LIGO and future plans to detect GW signals by ground-based interferometers to probe the astronomy and cosmology.