The universe is a natural laboratory for investigating physics. The unique properties of neutrinos make them excellent cosmic messengers to explore astronomy, particle physics, and cosmology. The IceCube experiment discovered TeV-PeV neutrinos of cosmic origin. These neutrinos provide the only unobstructed view of the cosmic accelerators that power the highest energy radiation from the universe while also offering a beam to study fundamental physics. Observations of high-energy cosmic neutrinos have yielded significant results in recent years, including the identification of extragalactic sources and emissions from the Galactic Plane, and the coming years are anticipated to mark a golden age for discoveries. In this talk, I will discuss the searches for neutrino sources, the implications of the neutrino flavor composition, and the potential of probing dark matter and new physics, with an emphasis on my contributions to these topics. I will also remark on the detection prospects of the next-generation neutrino telescopes in addressing challenging questions.

Biography

Dr. Qinrui Liu is currently a postdoctoral fellow at Queen's University and an associate postdoctoral researcher at Perimeter Institute in Canada. She obtained her bachelor's degree in 2016 at Wuhan University and Ph.D. degree in 2021 at the University of Wisconsin-Madison under the supervision of Prof. Francis Halzen. She is a member of the IceCube Collaboration and her research focuses on high-energy cosmic neutrinos. She is interested in neutrino source studies, dark matter and new physics studies with astrophysical observations. Additionally, she explores phenomenology using current experimental data on cosmic neutrinos and investigates detection prospects with future neutrino experiments.

Inviter: Ning-Qiang Song