This week's Lunch Talk will be given by  Xinyue Shi (史欣玥), at 11:30AM Dec. 26th (Thursday) in the 19th-floor Observatory Hall (天文台报告厅).  She will present her work on the “Ultra-high energy neutrinos: production, observation and astrophysical origin”. Below is the abstract.

Abstract: Ultra-high energy (UHE) neutrinos as cosmic messengers carry unique information to advance the understanding of extreme astrophysical objects and environments as well as possible probes for discovering new physics. Nine years after the completion the IceCube Neutrino Observatory, it has detected about 100 neutrinos with energies between 100 TeV and 10 PeV, but the astrophysical origin of these neutrinos is still unclear. In this review talk, I will give a summary of the mechanisms for producing UHE neutrinos, including our work --the pB process. Then, I will introduce the experimental mechanism and observation results of IceCube and the theoretical predictions of neutrino flux from some energetic astrophysical sources.