讲座主题：Freeze-In Dark Matter through Neutrino Portal with an Early Matter Era and EvoEMD

专家姓名：吴永成

工作单位：南京师范大学

讲座时间：2022年9月9日10:00-11:30

讲座地点：腾讯会议：942-681-636

主办单位：烟台大学物理与电子信息学院

内容摘要：

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.

主讲人介绍：

吴永成博士，研究生毕业于清华大学物理系，之后加入加拿大卡尔顿大学以及美国俄克拉荷马州立大学进行博士后的研究工作，回国后加入了南京师范大学物理科学与技术学院。吴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，暗物质以及和电弱相变相关的研究。