Abstract The possibility of baryons cooled by a millicharged dark matter (mDM) via mDM-baryons scattering has recently been proposed to explain the observation discrepancy from the experiment to detect the global epoch of reionization signature (EDGES). In this sense, we analyze the Jeans instability of self-gravitational systems in the background of mDM under kinetic regime that the collisionless Boltzmann equation and Poisson equation have been combined to obtain the modified dispersion relation. It is shown that the effect of mDM is significant on the dynamics of gravitational collapse, i.e., the presence of mDM makes the self-gravitational systems more difficult to collapse relatively.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11763006 and 11863004), the fund from the Jiangxi Provincial Key Laboratory of Fusion and Information Control (Grant No. 20171BCD40005), and the Project of Scientific and Technological Innovation Base of Jiangxi Province, China (Grant No. 20203CCD46008).
Corresponding Authors:
Hui Chen, San-Qiu Liu
E-mail: hchen61@ncu.edu.cn;sqlgroup@ncu.edu.cn
Cite this article:
Hui Chen(陈辉), Wei-Heng Yang(杨伟恒), Yu-Zhen Xiong(熊玉珍), and San-Qiu Liu(刘三秋) Kinetic theory of Jeans' gravitational instability in millicharged dark matter system 2022 Chin. Phys. B 31 070401
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