Effects of primordial black holes on dark matter models
Effects of primordial black holes on dark matter models
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原初黑洞对暗物质模型的影响
DOI：
10.1103/physrevd.102.095018
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发表时间：
2020
影响因子：
5
通讯作者：
Shams Es Haghi, Barmak
中科院分区：
文献类型：
--
作者：
Gondolo, Paolo;Sandick, Pearl;Shams Es Haghi, Barmak
我们研究了原始黑洞(PBH)的霍金蒸发产生暗物质的影响，在可能有第二种良好动机的暗物质产生机制的情况下，例如冻结、冻结或引力产生。我们表明，PBH和暗物质的替代来源之间的相互作用可以引起对每个产生机制所需的暗物质丰度的模型无关的修改，这反过来又影响暗物质探测的前景。特别是，我们证明了对于冻结机制，考虑冻结后PBHs的蒸发，需要比热暗物质的正则值更大的暗物质粒子湮灭截面。对于由于与热浴的弱耦合而缺乏热化的机制，我们证明了PBH对暗物质丰度的贡献导致了对更弱耦合的要求。此外，我们还指出，当初始多溴联苯的大量丰度导致早期物质占主导地位时，仅有多溴联苯蒸发并不能解释今天暗物质的全部丰度。在这种情况下，需要一种额外的生产机制，而不是在辐射为主的时期形成和蒸发多溴联苯的情况。
We investigate the effects of producing dark matter by the Hawking evaporation of primordial black holes (PBHs) in scenarios that may have a second well-motivated dark matter production mechanism, such as freeze-out, freeze-in, or gravitational production. We show that the interplay between PBHs and the alternative sources of dark matter can give rise to model-independent modifications to the required dark matter abundance from each production mechanism, which in turn affect the prospects for dark matter detection. In particular, we demonstrate that for the freeze-out mechanism, accounting for the evaporation of PBHs after freeze-out demands a larger annihilation cross section of dark matter particles than its canonical value for a thermal dark matter. For mechanisms lacking thermalization due to a feeble coupling to the thermal bath, we show that the PBH contribution to the dark matter abundance leads to the requirement of an even feebler coupling. Moreover, we show that when a large initial abundance of PBHs causes an early matter-dominated epoch, PBH evaporation alone cannot explain the whole abundance of dark matter today. In this case, an additional production mechanism is required, in contrast to the case when PBHs are formed and evaporate during a radiation-dominated epoch.