arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.01766hep-phastro-ph.HE
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矢量暗物质的引力产生

Gravitational production of vector dark matter

Aqeel Ahmed, Bohdan Grzadkowski, Anna Socha

摘要:

研究了一个矢量暗物质模型,它只通过引力相互作用与标准模型联系。它已被详细示出如何在不同FLRW几何的矢量场的正则量子化意味着它的一些动量模式的快子增强。模式方程的近似解已被发现,并对精确的数值验证。德西特几何已被假定在通货膨胀,而通货膨胀后,一个非标准的宇宙学时代的再加热与通用状态方程已被通过,其次是辐射占主导地位的宇宙。它已被证明,引力产生的暗矢量的频谱是围绕着一个特征的共同运动的动量$k_\star$,这是确定在方面的质量矢量$m_X$,在膨胀期间的哈勃参数$H_{\rm I}$,状态方程参数$w$和再加热的效率$γ$。与观测到的暗物质遗迹丰度一致的参数空间区域已经确定,证明引力产生是矢量暗物质的可行机制。本文所得到的结果适用于各种可能的模型的膨胀/再加热与非标准宇宙学参数有效地由相应的状态方程和效率的再加热。

英文摘要:

A model of vector dark matter that communicates with the Standard Model only through gravitational interactions has been investigated. It has been shown in detail how does the canonical quantization of the vector field in varying FLRW geometry implies a tachyonic enhancement of some of its momentum modes. Approximate solutions of the mode equation have been found and verified against exact numerical ones. De Sitter geometry has been assumed during inflation while after inflation a non-standard cosmological era of reheating with a generic equation of state has been adopted which is followed by the radiation-dominated universe. It has been shown that the spectrum of dark vectors produced gravitationally is centered around a characteristic comoving momentum $k_\star$ that is determined in terms of the mass of the vector $m_X$, the Hubble parameter during inflation $H_{\rm I}$, the equation of state parameter $w$ and the efficiency of reheating $γ$. Regions in the parameter space consistent with the observed dark matter relic abundance have been determined, justifying the gravitational production as a viable mechanism for vector dark matter. The results obtained in this paper are applicable within various possible models of inflation/reheating with non-standard cosmology parametrized effectively by the corresponding equation of state and efficiency of reheating.

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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