Gravitino production by primordial black hole evaporation and constraints on the inhomogeneity of the early universe
Gravitino production by primordial black hole evaporation and constraints on the inhomogeneity of the early universe
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DOI：
10.1088/0264-9381/23/6/004
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发表时间：
2004-06
影响因子：
3.5
通讯作者：
M. Khlopov;A. Barrau;J. Grain
中科院分区：
文献类型：
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作者：
M. Khlopov;A. Barrau;J. Grain
在超引力模型中，轻的原始黑洞的蒸发应该是引力子的来源。通过考虑这一过程，推导出初始质量小于109 g的小黑洞丰度的新的严格限制。在最小超引力中，蒸发的引力子随后衰变为级联的非平衡粒子，导致形成元素，其丰度受到观测的限制。在规范介导的超对称性破缺模型中，它们的密度被要求不过于接近宇宙。因此，在小尺度上具有显著不均匀性的宇宙学模型被排除在外。
In supergravity models, the evaporation of light primordial black holes should be a source of gravitinos. By considering this process, new stringent limits are derived on the abundance of small black holes with initial masses less than 109 g. In minimal supergravity, the subsequent decay of evaporated gravitinos into cascades of non-equilibrium particles leads to the formation of elements whose abundance is constrained by observations. In gauge mediated supersymmetry breaking models, their density is required not to overclose the universe. As a result, cosmological models with substantial inhomogeneities on small scales are excluded.