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arXiv 2102.06214hep-phastro-ph.COhep-th
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再加热过程中暗物质的引力产生

Gravitational Production of Dark Matter during Reheating

Yann Mambrini, Keith A. Olive

备注：
6 pages, 4 figures; several improvements, version published in Physical Review D
发表信息：
Phys. Rev. D 103, 115009 (2021)
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摘要：

我们考虑了在再加热过程中暗物质的直接$s$通道引力产生.独立于暗物质候选者的身份或其非引力相互作用，引力过程总是存在的，并提供了一个最小的生产机制。在再加热过程中，迅速产生具有最高温度$T_{\rm max}$的热浴，并且温度随着暴胀子继续衰减而降低，直到辐射和暴胀子振荡的能量密度相等，在$T_{\rm RH}$。在这些振荡过程中，发生了暗物质的$s$通道引力产生.我们发现，暗物质（费米子或标量）的丰度主要取决于组合$T_{\rm max}^4/T_{\rm RH} M_P^3$。我们发现，一个足够的密度的暗物质可以产生在很宽的范围内的暗物质质量：从一个GeV的ZeV。

英文摘要：

We consider the direct $s$-channel gravitational production of dark matter during the reheating process. Independent of the identity of the dark matter candidate or its non-gravitational interactions, the gravitational process is always present and provides a minimal production mechanism. During reheating, a thermal bath is quickly generated with a maximum temperature $T_{\rm max}$, and the temperature decreases as the inflaton continues to decay until the energy densities of radiation and inflaton oscillations are equal, at $T_{\rm RH}$. During these oscillations, $s$-channel gravitational production of dark matter occurs. We show that the abundance of dark matter (fermionic or scalar) depends primarily on the combination $T_{\rm max}^4/T_{\rm RH} M_P^3$. We find that a sufficient density of dark matter can be produced over a wide range of dark matter masses: from a GeV to a ZeV.

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