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arXiv 2006.07901astro-ph.COastro-ph.GA
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重子-暗物质相互作用对IGM温度和磁场作用下tSZ效应的影响

Implications of baryon-dark matter interaction on IGM temperature and tSZ effect with magnetic field

Arun Kumar Pandey, Sunil Malik, T. R. Seshadri

摘要:

我们表明,宇宙磁场和重子和暗物质之间的可能的非标准相互作用的综合效应具有有趣的后果的热Sunyaev $-$ Zel ${'}$多维奇(tSZ)效应取决于温度和星系际介质的电离状态。由于重子和暗物质之间的相对速度以及它们之间的温度差,它们之间的拖曳力导致这两种物质之间的热传递。同时,双极扩散和衰减的磁湍流也会使重子升温。这两个过程的相互作用导致宇宙的热态和电离态的不同演化历史,从而通过tSZ效应影响小尺度下的CMB谱。在这项工作中,我们计算了温度,电离分数和y参数的CMB的不同强度的磁场和相互作用截面的演变。我们注意到,一个$σ_0=10^{-42}$ m $^{2}$的相互作用截面(具有一个磁场强度为$3.0$ nG)与具有类似强度的磁场但重子和暗物质之间没有这种相互作用的情况相比,将y参数减小了一个数量级。

英文摘要:

We show that the combined effect of cosmic magnetic field and a possible non-standard interaction between baryons and dark matter has interesting consequences on the thermal Sunyaev$-$Zel${'}$dovich (tSZ) effect depending on the temperature and the ionization state of the intergalactic medium. The drag force between the baryons and dark matter due to the relative velocity between them, and their temperature difference results in heat transfer between these two species. At the same time the ambipolar diffusion and the decaying magnetic turbulence tends to heat up the baryons. This interplay of these two processes give rise to different evolution histories of the thermal and ionization state of the universe and hence influences the CMB spectrum at small scales through the tSZ effect. In this work, we have computed the evolution of the temperature, ionization fraction and the y-parameter of the CMB for different strengths of the magnetic field and the interaction cross-section. We note that an interaction cross-section of $σ_0=10^{-42}$ m$^{2}$ (with a magnetic field strength of $3.0$ nG) reduces the y-parameter by an order of magnitude as compared to the case with similar strength of magnetic field but where there is no such interaction between the baryons and dark matter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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