On mass spectra of primordial black holes

TL;DR

This paper explores how considering classical scalar field motion and quantum fluctuations during inflation can lead to different primordial black hole mass spectra, challenging existing formation models and observational constraints.

Contribution

It introduces a modified mechanism for PBH formation that accounts for scalar field dynamics, resulting in alternative mass spectra.

Findings

Classical scalar field motion affects PBH mass distribution.

Quantum fluctuations during inflation influence PBH formation.

New mass spectra can potentially reconcile models with observations.

Abstract

Evidences for the primordial black holes (PBH) presence in the early Universe renew permanently. New limits on their mass spectrum challenge existing models of PBH formation. One of the known model is based on the closed walls collapse after the inflationary epoch. Its intrinsic feature is multiple production of small mass PBH which might contradict observations in the nearest future. We show that the mechanism of walls collapse can be applied to produce substantially different PBH mass spectra if one takes into account the classical motion of scalar fields together with their quantum fluctuations at the inflationary stage.