学术活动
 您现在的位置：首页 > 学术活动 > 专题学术报告/Seminar
 (Seminar) The Warm Dark Matter Doorframe for Light Dark Matter Direct Detection Experiments
 2019-11-26  【大 中 小】【打印】【关闭】

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Seminar

Title

 The Warm Dark Matter Doorframe for Light Dark Matter Direct Detection Experiments

Speaker

 Dr. Ran Huo

Affiliation

Date

14:00, Nov. 26, 2019, Tuesday

Venue

Abstract

If dark matter has even been in sufficient thermal contact with the visible sector and sufficiently light, the thermal motion inherited from the visible sector will cause significant free streaming effect which is subject to the structure formation constraint, similar to the benchmark thermal warm dark matter model. Here we identify the interaction responsible for such thermal contact to be the interaction probed by the deep underground dark matter direct detection experiments. With the kinetic decoupling technique on the $m_\chi$ vs.~$\sigma$ plot we determine the bound shape in detail, and find that recasting the recent stellar streams bound gives a constraint of $m_\chi\gtrsim92~\text{keV}$, and it gets relaxed to $m_\chi\gtrsim45~\text{keV}$ for a smaller cross section of $\sigma\lesssim10^{-46}~\text{cm}^2$ with some model dependence. That can be taken as a generic no go'' constraint for light dark matter direct detection experiments, and the known caveats are if dark matter is axion-like with an early frozen form in potential, or if there is Brownian motion protection of the free streaming.

Contact Person

 IE6.0浏览器，1024X768分辨率 版权所有 © 福彩快3正规网站 地址：北京市海淀区中关村东路55号　邮政编码：100190【】 京公网安备1101080094号