Stochastic gravitational waves associated with the formation of primordial black holes - Sorbonne Université Access content directly
Journal Articles Physical Review D Year : 2017

Stochastic gravitational waves associated with the formation of primordial black holes

Abstract

Primordial black hole (PBH) mergers have been proposed as an explanation for the gravitational wave events detected by the LIGO collaboration. Such PBHs may be formed in the early Universe as a result of the collapse of extremely rare high-sigma peaks of primordial fluctuations on small scales, as long as the amplitude of primordial perturbations on small scales is enhanced significantly relative to the amplitude of perturbations observed on large scales. One consequence of these small-scale perturbations is generation of stochastic gravitational waves that arise at second order in scalar perturbations, mostly before the formation of the PBHs. These induced gravitational waves have been shown, assuming gaussian initial conditions, to be comparable to the current limits from the European Pulsar Timing Array, severely restricting this scenario. We show, however, that models with enhanced fluctuation amplitudes typically involve non-gaussian initial conditions. With such initial conditions, the current limits from pulsar timing can be evaded. The amplitude of the induced gravitational-wave background can be larger or smaller than the stochastic gravitational-wave background from supermassive black hole binaries.
Fichier principal
Vignette du fichier
PhysRevD.95.043511.pdf (333.91 Ko) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

hal-01494918 , version 1 (02-02-2024)

Identifiers

Cite

Tomohiro Nakama, Joseph Silk, Marc Kamionkowski. Stochastic gravitational waves associated with the formation of primordial black holes. Physical Review D, 2017, 95 (4), pp.043511. ⟨10.1103/PhysRevD.95.043511⟩. ⟨hal-01494918⟩
120 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More