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arXiv 1408.0955gr-qcastro-ph.CO
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原始黑洞的双重形成

The double formation of primordial black holes

Tomohiro Nakama

备注：
16 pages, 7 figures, revised version with more references, text overlap warning appears due to the full description of the methods which were also used in arXiv:1310.3007. arXiv admin note: text overlap with arXiv:1310.3007
发表信息：
JCAP10(2014)040
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摘要：

原初黑洞是宇宙学中探测辐射主导时期重新进入哈勃半径的小尺度原初不均匀性的有用工具。在本文中，我们称之为PBH的双重形成的现象，下面描述，进行了探讨。假设存在一个高扰动区域，该区域在穿过视界后坍缩形成PBH，并且该区域叠加在更大的区域上，该区域在再入时也坍缩。然后，我们可以预期，在穿过这个区域时，中心较小区域的坍缩，随后在其各自的穿过时，较大扰动的另一个坍缩。较早形成的较小的PBH应该在第二次崩溃中被吞噬，导致单个较大的PBH作为最终状态。本文报道了这种双PBH形成的第一个直接的数值证实。与此相关，我们还讨论了高频模式对PBH形成的影响。

英文摘要：

Primordial black holes (PBHs) are a useful tool in cosmology to probe primordial inhomogeneities on small scales that reenter the Hubble radius during the radiation dominated epoch. In this paper, a phenomenon we call the double formation of PBHs, described below, is explored. Suppose there exists a highly perturbed region which will collapse to form a PBH after the horizon crossing of this region, and farther that this region is superposed on much larger region, which also collapses upon reentry. One then expects the collapse of the central smaller region at the time of the crossing of this region, followed by another collapse of the larger perturbation at the time of its respective crossing. The smaller PBH, formed earlier, should be swallowed in the second collapse leading to a single larger PBH as the final state. This paper reports the first direct numerical confirmation of such double PBH formation. Related to this, we also discuss the effects of high-frequency modes on the formation of PBHs.

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