再加热期间的原初黑洞失控增长
PBH runaway during reheating
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- Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University（上海交大李政道研究所与物理与天文学院）
- Université Paris-Saclay（巴黎萨克雷大学）
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中文总结 AI 辅助
该研究将原初黑洞等离子体吸收的失控增长分析扩展到再加热时期，推导出一般再加热历史的解析解，识别出两种失控区间，并提出组合律，解析结果与数值模拟高度吻合。
中文摘要 AI 辅助
最近研究表明，原初黑洞通过吸收周围等离子体而增长的过程，在辐射主导时期会表现出临界行为。我们将此分析扩展到再加热时期，并为一般再加热历史推导出解析解。我们证明，再加热会改变失控吸收的临界条件，使其同时依赖于再加热动力学和黑洞形成时间。我们识别出两个不同的区间：失控增长发生在再加热期间，或者由再加热期间积累的质量在辐射主导开始后被触发。更一般地，我们推导出一个简单的组合律，描述独立的质量增长机制如何跨连续宇宙学时期结合。将其应用于辐射吸收和暴胀子吸积，我们获得的解析结果与完整数值演化高度一致。
英文摘要
The growth of primordial black holes through the absorption of the surrounding plasma has recently been shown to exhibit a critical behavior during radiation domination. We extend this analysis to the reheating era and derive analytical solutions for general reheating histories. We show that reheating modifies the critical condition for runaway absorption, making it dependent on both the reheating dynamics and the black-hole formation time. We identify two distinct regimes: runaway growth occurring during reheating, or being triggered after the onset of radiation domination by the mass accumulated during reheating. More generally, we derive a simple composition law describing how independent mass- growth mechanisms combine across successive cosmological eras. Applying it to radiation absorption and inflaton accretion, we obtain analytical results in excellent agreement with the full numerical evolution.
