Lepton Flavour Asymmetries and the Mass Spectrum of Primordial Black Holes

TL;DR

This paper explores how lepton flavour asymmetries affect primordial black hole formation and their gravitational wave signatures, proposing gravitational-wave observations as a new way to probe early Universe asymmetries.

Contribution

It introduces the impact of lepton flavour asymmetries on primordial black hole spectra and suggests using gravitational-wave data to study early Universe conditions.

Findings

Primordial black hole spectrum can be influenced by lepton flavour asymmetries.

Current gravitational wave events may originate from primordial black holes with asymmetries.

Gravitational-wave astronomy can serve as a probe of early Universe lepton asymmetries.

Abstract

We study the influence of lepton flavour asymmetries on the formation and the mass spectrum of primordial black holes. We estimate the detectability of their mergers with LIGO/Virgo and show that the currently published gravitational wave events may actually be described by a primordial black hole spectrum from non-zero asymmetries. We suggest to use gravitational-wave astronomy as a novel tool to probe how lepton flavour asymmetric the Universe has been before the onset of neutrino oscillations.