Solving puzzles of GW150914 by primordial black holes

TL;DR

This paper proposes that primordial black holes, naturally arising from a modified baryogenesis mechanism, can explain the properties of black hole binaries observed in GW150914, including their masses, spins, and potential dark matter contribution.

Contribution

It demonstrates that a modified Affleck-Dine baryogenesis model naturally produces primordial black holes with properties matching GW150914 observations, linking cosmology and gravitational wave data.

Findings

PBH distribution explains GW150914 black hole properties

PBHs could constitute a significant fraction of Dark Matter

Model predicts observable signatures for future tests

Abstract

The black hole binary properties inferred from the LIGO gravitational wave signal GW150914 posed several serious problems. The high masses and low effective spin of black hole binary can be explained if they are primordial (PBH) rather than the products of the stellar binary evolution. Such PBH properties are postulated ad hoc but not derived from fundamental theory. We show that the necessary features of PBHs naturally follow from the slightly modified Affleck-Dine (AD) mechanism of baryogenesis. The log-normal distribution of PBHs, predicted within the AD paradigm, is adjusted to provide an abundant population of low-spin stellar mass black holes. The same distribution gives a sufficient number of quickly growing seeds of supermassive black holes observed at high redshifts and may comprise an appreciable fraction of Dark Matter which does not contradict any existing observational limits. Testable predictions of this scenario are discussed.