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Abstract:
The neutrino mass sum is a fundamental particle physics parameter that will be measured cosmologically over the next several years, though a robust determination will require a precise theoretical understanding of neutrino clustering. Recently I developed a non-linear cosmological perturbation theoryfor massive neutrinos. It combines three ingredients: multi-fluid perturbation theories discretizing neutrinos' Fermi-Dirac distribution, non-linear coupling between different length scales, and Fast Fourier Transform acceleration. After motivating a consideration of neutrino masses larger than the recent DESI bound, I will describe the resulting neutrino power spectrum, includingits dependence upon time and neutrino momentum, and test it against N-bod simulations. Finally, I will discuss ongoing and planned work on observable weak lensing predictions and improvements to N-body neutrino simulations.
Biography:
Amol Upadhye received his PhD from Princeton University in the US, supervised by Prof. Paul J. Steinhardt. He has held a Kavli Institute for CosmologicalPhysics fellowship at the University of Chicago; a Director's Postdoctoral Fellowship at Argonne National Laboratory; and postdoctoral positions at theUniversity of Wisconsin, the University of New South Wales, and Liverpool John Moores University. Since September 2023, he has been an Associate ResearchProfessor (副研究员) at the South-Western Institute For Astronomy Research at Yunnan University. His research focuses on the contribution of massive neutrinos to the large-scale cosmic structure.
Alternative online link：https://meeting.tencent.com/dm/XXKs36sCcDsH
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