Speaker: 黄俊午/Jun-Wu Huang (Perimeter Institute for Theoretical Physics)
Abstract: In this talk, I will describe a recent study of the plasma dynamics during resonant energy transfer from light boson dark matter into the standard model electron ion plasma in the early universe. We show that resonant energy transfer triggers a variety of plasma instabilities that lead to the excitation of ion acoustic oscillations. These oscillations shut off the resonant transfer of energy. As an example, we demonstrate that the cosmological dark photon dark matter constraints are weakened by factors of 3000 to 10^7 across ten orders of magnitude in dark photon mass.
Biography: Junwu Huang received his B.S. from Peking University in 2012 and his Ph.D. from Stanford University in 2017. He joined the Perimeter Institute as a postdoctoral fellow in 2017 and has been a faculty member since June 2020. He is primarily interested in understanding what lies beyond the Standard Model of particle physics. He is interested in pursuing novel, low-energy experiments for weakly coupled particles that make use of small-scale experimental techniques. He is also interested in understanding the dynamics and observational consequences of collective phenomena in the dark matter fluid, and in designing new searches based on astrophysical and cosmological measurements.