The double formation of primordial black holes

Abstract

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.

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

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Cited by in corpus (14)

• Stochastic gravitational waves associated with the formation of primordial black holes
• Primordial black holes as biased tracers
• Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter
• PBH formation from spherically symmetric hydrodynamical perturbations: a review
• Supermassive black holes formed by direct collapse of inflationary perturbations
• Peaks and primordial black holes: the effect of non-Gaussianity
• The long-short wavelength mode coupling tightens primordial black hole constraints
• Primordial black hole compaction function from stochastic fluctuations in ultra-slow-roll inflation
• Numerical simulation of type II primordial black hole formation
• Ultracompact minihalos associated with stellar-mass primordial black holes
• Primordial Black Hole formation from overlapping cosmological fluctuations
• Non-spherical effects on the mass function of Primordial Black Holes
• Simulation of Primordial Black Holes with large negative non-Gaussianity
• Effect of stochastic kicks on primordial black hole abundance and mass via the compaction function