講座主題：Freeze-In Dark Matter through Neutrino Portal with an Early Matter Era and EvoEMD
專家姓名：吳永成
工作單位：南京師范大學
講座時間：2022年9月9日10:00-11:30
講座地點：騰訊會議：942-681-636
主辦單位：煙臺大學物理與電子信息學院
內容摘要：
Dark Matter is an important direction for pursuing physics beyond the Standard Model. There are already various experiments searching for the Dark Matter. However, for the Freeze-In Dark Matter, due to the extremely tiny coupling between the dark matter and SM particles, there will be no sensitivity for the DM experiments. On the other hand, we actually have no direct evidence for the evolution of the Universe before BBN/CMB. This provides the possibility that we can add an early matter dominant era, which will also change the accumulation of the Freeze-In dark matter. We investigate such case in a neutrino portal dark matter model, and find that in order to overcome the faster expansion during the EMD as well as the dilution induced from the entropy production, larger coupling between DM and the SM particles is needed which also leads to detectable signal in DM experiments. In the second part of this talk, I will present the package EvoEMD that can be used to consider cosmic evolution with or without an early matter-dominated era.
主講人介紹：
吳永成博士，研究生畢業于清華大學物理系，之后加入加拿大卡爾頓大學以及美國俄克拉荷馬州立大學進行博士后的研究工作，回國后加入了南京師范大學物理科學與技術學院。吳永成博士的主要研究方向是粒子物理唯象，主要包括Higgs物理，暗物質以及和電弱相變相關的研究。
