Primordial black holes and primordial nucleosynthesis: Effects of hadron injection from low mass holes
Primordial black holes and primordial nucleosynthesis: Effects of hadron injection from low mass holes
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原初黑洞和原初核合成：低质量空穴注入强子的影响
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Yokoyama
中科院分区：
文献类型：
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作者：
K. Kohri;J. Yokoyama
本文研究了在原初核合成早期（t = 10^{-3}-10^4 sec），蒸发原初黑洞（PBH）注入强子的影响.发射出的夸克-反夸克对或胶子立即碎裂成大量强子，并散射出由光子、电子和核子组成的热等离子体。对于相对低质量的空穴，我们指出，主要的作用是通过强相互作用引起的周围质子和中子之间的相互转换发射强子。即使在中子和质子之间的相互作用的冻结时间之后，也会产生更多的中子，并且合成的轻元素丰度可能会急剧变化。通过理论预测与观测数据的比较，我们对PBH的密度和寿命进行了约束。我们得到了PBH初始质量分数的上限，当10 ^8 g < M < 10^{10} g时，\beta < 10 ^{-20};当10^{10} g < M < 3 * 10^{10} g时，\beta < 10^{-22}。
We investigate the influence of hadron injection from evaporating primordial black holes (PBHs) in the early stage of the primordial nucleosynthesis era (t = 10^{-3} - 10^4 sec). The emitted quark-antiquark pairs or gluons immediately fragment into a lot of hadrons and scatter off the thermal plasma which is constituted by photons, electrons and nucleons. For the relatively low mass holes we point out that the dominant effect is the inter-conversion between ambient proton and neutron through the strong interaction induced by the emitted hadrons. Even after the freeze-out time of the week interactions between neutron and proton, more neutrons are produced and the synthesized light element abundances could be drastically changed. Comparing the theoretical predictions with the observational data, we constrain the PBH's density and their lifetime. We obtain the upper bound for PBH's initial mass fraction, \beta < 10^{-20} for 10^8 g < M < 10^{10} g, and \beta < 10^{-22} for 10^{10} g < M < 3 * 10^{10} g.