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Abstract:
Freeze-In Massive Particle (FIMP) is characterized by feeble couplings to the Standard Model particles. Such feeble interactions still allow for FIMP dark matter to be produced by, for instance, annihilations of the Standard Model particles, whereas the backward reactions rarely occur, preventing the dark matter candidate from reaching thermal equilibrium. A large class of models may have a FIMP dark matter candidate, and a well-known example is gravitino. In this talk, I will argue that in some cases the produced dark matter number density is strongly affected by inflaton dynamics after the end of inflation. To illustrate this point, I will discuss some simple examples of dark matter scenarios. Then, I will extend the argument to more generic cases where inflaton undergoes an anharmonic oscillation during reheating, and emphasize that the dark matter production during this period significantly alters the prediction of the dark matter relic abundance.
Biography:
My research focuses on theoretical particle physics and cosmology, especially physics beyond the standard model, which includes 1. dark matter, such as WIMP, dark photon, axion, and gravitino, 2. cosmology, in which my main topics are on cosmic inflation and baryogenesis, 3. neutrino physics, particularly topics related to dark matter and cosmology, 4. Higgs physics, which includes collider phenomenology and building models.
Meeting room: https://zoom.com.cn/j/93579891950
Password: 123456