arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01149astro-ph.COgr-qchep-ph
收藏

非标准宇宙学中的旁观者暗物质

Spectator dark matter in non-standard cosmologies

Catarina Cosme, Tommi Tenkanen

摘要:

它已被证明,所观察到的暗物质(DM)的丰度可以产生的能量次显性标量场在暴胀过程中的量子涨落的放大。在本文中,我们研究了这种“旁观者暗物质“的情况下,在早期宇宙的膨胀率的变化的鲁棒性。与标准辐射主导(RD)方案相比,两个方面将发生变化:DM能量密度随时间的变化不同,并且DM等曲率扰动谱也将不同于RD情况下的结果。这些可以施加相当大的变化,模型参数的值,使该领域构成所有DM,同时满足所有的观测约束。我们研究了自由和自我相互作用DM的情况下,非标准的膨胀和量化的变化的情况下,一个标准的宇宙学历史。我们还讨论了通过原始DM等曲率和非高斯的情况下的可测试性。

英文摘要:

It has been shown that the observed dark matter (DM) abundance can be produced by amplification of quantum fluctuations of an energetically subdominant scalar field during inflation. In this paper, we study the robustness of this "spectator dark matter" scenario to changes in the expansion rate of the early Universe. Compared to the standard radiation-dominated (RD) scenario, two aspects will change: the DM energy density evolves differently as a function of time, and also the DM isocurvature perturbation spectrum will be different from the result in the RD case. These can impose sizeable changes to the values of model parameters which allow the field to constitute all DM while simultaneously satisfying all observational constraints. We study both free and self-interacting DM in scenarios with non-standard expansion and quantify the changes to the cases with a standard cosmological history. We also discuss testability of the scenario through primordial DM isocurvature and non-Gaussianity.

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。

↑