PBH Evaporation, Baryon Asymmetry, and Dark Matter
PBH Evaporation, Baryon Asymmetry, and Dark Matter
复制标题
PBH 蒸发、重子不对称性和暗物质
DOI：
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发表时间：
2020
影响因子：
1.1
通讯作者：
A. Dolgov
中科院分区：
文献类型：
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作者：
A. Chaudhuri;A. Dolgov
足够轻的原始黑洞（PBH）可以在非常早期的宇宙中蒸发，并稀释预先存在的重子不对称性和/或稳定遗迹的冻结密度。当PBH在宇宙能量密度中占主导地位时，这种效应在PBH衰变的情况下尤其强烈。在简化的δ函数质谱假设和瞬时衰变近似下，首先解析地计算了减少的大小。在实际的情况下，指数衰减和扩展的PBH质谱的计算进行了数值。超对称遗迹的冻结数密度的减少为它们打开了一个更宽的质量窗口，成为可行的暗物质候选者。
Sufficiently light primordial black holes (PBH) could evaporate in the very early universe and dilute the preexisting baryon asymmetry and/or the frozen density of stable relics. The effect is especially strong in the case that PBHs decayed if and when they dominated the cosmological energy density. The size of the reduction is first calculated analytically under the simplifying assumption of the delta-function mass spectrum of PBH and instant decay approximation. In the realistic case of exponential decay and for an extended mass spectrum of PBH the calculations are made numerically. Resulting reduction of the frozen number density of the supersymmetric relics opens for them a wider mass window to become viable dark matter candidate.