A new mechanism for primordial black hole formation during reheating

Abstract

The Reheating process at the end of inflation is often modeled by an oscillating scalar field which shows a background dust-like behaviour, prompting the analysis of gravitational collapse and black hole formation in this era to be approached by the spherical collapse of standard structure formation. In the scalar field dark matter structure formation process virialized halos halt the direct collapse, resulting in halos with condensed central cores at the de Broglie scale of the dominant scalar field. We show that a similar process can take place during reheating, leading to the formation of primordial black holes (PBHs). We study the formation of PBHs through the gravitational further collapse of structures virialized during reheating, looking at the collapse of either the whole structure, or that of the central core within these configurations. We compute the threshold amplitude for the density contrast to undergo this process, for both free and self-interacting scalar fields. We discuss the relevance of our results for the abundance of PBHs at the lower end of the mass spectrum.

6 pages, 1 figure. Minor updates to accord with the accepted version in Phys. Rev. D

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Cited by in corpus (15)

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• Threshold of Primordial Black Hole Formation against Velocity Dispersion in Matter-Dominated Era
• Stochastic Gravitational Waves from Post-inflationary Structure Formation
• Primordial Black Hole Formation in Non-Standard Post-Inflationary Epochs
• Primordial black holes: constraints, potential evidence and prospects
• Production of PBHs from inflaton structure
• Simulations of Ellipsoidal Primordial Black Hole Formation
• Constraints on primordial black holes for nonstandard cosmologies
• Gravothermalizing into primordial black holes, boson stars, and cannibal stars
• Post-inflationary structure formation boosted by parametric self-resonance
• Corrections to Hawking Radiation from Asteroid Mass Primordial Black Holes: I. Formalism of Dissipative Interactions in Quantum Electrodynamics
• Hierarchical Merger of Primordial Black Holes in Dwarf Galaxies