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SUMMARY:Extremely High-Energy Particle Astrophysics Symposium 2026 (X-HEPA
 S 2026)
DTSTART:20261213T150000Z
DTEND:20261215T150000Z
DTSTAMP:20260910T101600Z
UID:indico-event-8@indico-icehap.phys.s.chiba-u.ac.jp
DESCRIPTION:Speakers: Aya Ishihara (ICEHAP\, Chiba University)\, Nobuhiro 
 Shimizu (Chiba University)\, Kota Murase (Yukawa Institute for Theoretical
  Physics)\, Hajime Takami (The university of Tokyo)\n\nNeutrinos offer a u
 niquely powerful way of observing the Universe: able to escape from the de
 nsest regions in nature and travel across cosmic distances unhindered and 
 undeflected by magnetic fields\, they carry unaltered information about th
 e most extreme phenomena in the cosmos. Over the past decades\, neutrino a
 stronomy has achieved remarkable milestones—from the discovery of solar 
 and supernova neutrinos to the establishment of neutrino oscillations and 
 a deeper understanding of weak interactions in astrophysical environments.
 \nMore recently\, the detection of high-energy astrophysical neutrinos has
  transformed the frontier of particle astrophysics at the highest energies
 . These advances are opening new insights into the most extreme accelerato
 rs in nature and into the physical conditions that govern particle acceler
 ation and propagation across cosmic distances. Neutrinos have become a cor
 nerstone of multimessenger astronomy\, a new frontier in which multiple co
 smic messengers are combined to provide complementary and interconnected v
 iews of astrophysical phenomena. In particular\, increasingly precise obse
 rvations of ultra-high-energy cosmic rays (UHECRs) have sharpened key ques
 tions: the identity of extreme sources\, the maximum achievable energies\,
  the composition at the highest energies\, and the role of magnetic fields
  and backgrounds in shaping what we observe at Earth. In parallel\, high-e
 nergy neutrinos provide a unique probe of hadronic processes in dense and 
 energetic environments\, pointing directly to sites where cosmic rays inte
 ract and produce pions. Together\, multimessenger observations offer deepl
 y connected perspectives on the highest-energy Universe.\nThis symposium w
 ill bring together experts in multimessenger astrophysics to discuss lesso
 ns from the past\, the status of our current understanding\, open problems
 \, and future opportunities—from source modeling and multimessenger cons
 istency tests to next-generation detectors and observatories. In doing so\
 , we will celebrate the 60th anniversary of Shigeru Yoshida\, whose contri
 butions have fundamentally advanced this field.\n \nImportant dates:\nReg
 istration deadline : 2026-XX-DD\nPoster presentations deadline : 2026-XX-D
 D\n \n\nhttps://indico-icehap.phys.s.chiba-u.ac.jp/event/8/
IMAGE;VALUE=URI:https://indico-icehap.phys.s.chiba-u.ac.jp/event/8/logo-12
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LOCATION:Awaji Yumebutai international conference center in Hyogo Japan
URL:https://indico-icehap.phys.s.chiba-u.ac.jp/event/8/
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