Title: High energy neutrino astronomy: What have we learned? 
Speaker: Prof.Eli Waxman (Weizmann Institute of Science) 
Moderator: Prof. Zhang Shuangnan
Time: 14:30, Oct 25
Place: Room C305, IHEP Main Building

Abstract:
The detection of high energy extra-terrestrial neutrinos by IceCube opens a new window for observations of the Universe. The speaker will discuss the origin of these neutrinos, the clues that their detection provide towards the solution of the long standing question of the origin of cosmic-rays, and the prospects for identifying the cosmic-ray sources and for studying open questions in astro- and particle- physics using combined electromagnetic and neutrino observations. 

About the speaker: 
Prof.Waxman is a theoretical astrophysicist. He made significant contributions to the understanding of explosions of massive stars, the formation of solar mass black holes, and the origin of ultra-high energy cosmic rays- particles which are a hundred million times more energetic than the particles produced in the LHC at CERN. The predictions of his theory of cosmic-ray origin, developed with the late John Bahcall of Princeton, drove the construction of a large, giga-ton, neutrino detector at the South Pole- IceCube. IceCube has recently begun collecting data, which appear to support the theory. Currently much of his time is devoted to a practical, Israeli- American project that aims to launch a mini-satellite, ULTRASAT, for testing high energy astrophysics theories. ULTRASAT will allow us to study stellar explosions and the dynamics associated with super-massive black holes, and may also help detect the sources of Gravitational Waves, predicted by Einstein back in 1915 but first observed by astronomers just this year.