{"id":16800,"date":"2025-10-02T14:50:00","date_gmt":"2025-10-02T05:50:00","guid":{"rendered":"https:\/\/www.icrr.u-tokyo.ac.jp\/?post_type=event_researcher&#038;p=16800"},"modified":"2025-10-16T13:14:18","modified_gmt":"2025-10-16T04:14:18","slug":"new%e3%80%902025%e5%b9%b410%e6%9c%882%e6%97%a5%e3%80%91neutrinos-at-the-highest-energies-icecubes-window-into-ultra-high-energy-cosmic-rays-maximilian-meier-chiba-university-2","status":"publish","type":"event_researcher","link":"https:\/\/www.icrr.u-tokyo.ac.jp\/en\/event_researcher\/16800\/","title":{"rendered":"&#8220;Neutrinos at the Highest Energies: IceCube\u2019s Window into Ultra-High-Energy Cosmic Rays&#8221;\/   Maximilian Meier (Chiba University)"},"content":{"rendered":"\n<figure class=\"wp-block-table\"><div class=\"js-scrollable\"><table><tbody><tr><td>Number<\/td><td>R7-3 \/ &nbsp;IPMU\/ILANCE\/ICRR joint seminar<\/td><\/tr><tr><td>Date&amp;Time<\/td><td>October 2, 2025. Thu. 15:30- <\/td><\/tr><tr><td>Place<\/td><td>ICRR 6F, Large Seminar Room<br>Zoom: <a href=\"https:\/\/u-tokyo-ac-jp.zoom.us\/j\/86096780466?pwd=RWzJSknDZ2e5ORqMNQNuRvgfaH00NJ.1\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/u-tokyo-ac-jp.zoom.us\/j\/86096780466?pwd=RWzJSknDZ2e5ORqMNQNuRvgfaH00NJ.1<\/a><\/td><\/tr><tr><td>Speaker<\/td><td>Maximilian Meier (Chiba University)<\/td><\/tr><tr><td>Title<\/td><td>&#8220;Neutrinos at the Highest Energies: IceCube\u2019s Window into Ultra-High-Energy Cosmic Rays&#8221;<\/td><\/tr><tr><td>Abstract<\/td><td>Ultra-high-energy cosmic rays (UHECRs) produce astrophysical neutrinos (TeV+) inside their sources and so-called cosmogenic neutrinos (PeV+) on their journey through the universe. These neutrinos are unique messengers from the distant and violent universe, able to probe the sources of UHECRs. The IceCube Neutrino Observatory is the largest neutrino detector in the world, instrumenting a cubic kilometer of Antarctic ice to catch these rare and elusive particles. In this talk, after briefly reviewing IceCube\u2019s recent studies of astrophysical neutrinos, I will present IceCube\u2019s world leading limit on the neutrino flux at the highest energies. For the first time the non-observation of cosmogenic neutrinos puts serious constraints on the composition of UHECRs. Finally, I put IceCube&#8217;s limit into context of the recent observation of an extremely-high-energy neutrino in KM3NeT.<\/td><\/tr><\/tbody><\/table><\/div><\/figure>\n","protected":false},"featured_media":0,"template":"","tag_year":[],"class_list":["post-16800","event_researcher","type-event_researcher","status-publish","hentry","en-US"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/event_researcher\/16800","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/event_researcher"}],"about":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/types\/event_researcher"}],"wp:attachment":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/media?parent=16800"}],"wp:term":[{"taxonomy":"tag_year","embeddable":true,"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/tag_year?post=16800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}