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arXiv 1407.2274astro-ph.CO
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暗物质与重子的超音速相对速度

Supersonic Relative Velocity between Dark Matter and Baryons: A Review

Anastasia Fialkov

摘要:

在这篇综述中,我们总结了气体和暗物质重组后产生的相对超音速对天体物理学和宇宙学的影响。相对速度在形式上对标准结果引入了二阶效应,因此在线性理论的框架中被忽略了。然而,当适当考虑时,速度产生的非微扰的贡献的增长结构,然后继承了大多数宇宙信号来自红移以上z ~ 10,在某些情况下,甚至可能传播到各种低红移观测,如重子声学振荡测量星系的分布。在较高的红移,超音速因此有强烈的影响,影响了第一个恒星形成晕的丰度在一个不均匀的方式,阻碍了第一个恒星的创造,留下痕迹的红移21厘米的信号中性氢,以及有其他重要的贡献,在高红移所有这些我们在这篇手稿审查。

英文摘要:

In this review we summarize the effect of relative supersonic velocities between gas and dark matter created right after recombination on astrophysics and cosmology. The relative velocities formally introduce a second order effect on the standard results and thus have been neglected in the framework of linear theory. However, when properly considered, the velocities yield a non-perturbative contribution to the growth of structures which is then inherited by the majority of cosmic signals coming from redshifts above z ~ 10, and in certain cases may even propagate to various low-redshift observables such as the Baryon Acoustic Oscillations measured from the distribution of galaxies. At higher redshifts, the supersonic velocities have thus strong impact affecting the abundance of first star forming halos in an inhomogeneous way, hindering creation of the first stars, leaving traces in the redshifted 21-cm signal of neutral hydrogen, as well as having other important contributions at high redshifts all of which we review in this manuscript.

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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