Stars and Black Holes from the very Early Universe

TL;DR

This paper explores a mechanism for forming primordial black holes and dense stars in the early universe, potentially explaining early quasars, gamma-ray bursts, and the existence of antimatter objects.

Contribution

It introduces a new model for primordial object formation during the QCD phase transition and BBN, including antimatter objects and their astrophysical implications.

Findings

Primordial black holes with masses above a few solar masses could form.

Dense primordial stars may evolve into early supernovae and gamma-ray bursts.

Some objects could be composed of antimatter.

Abstract

A mechanism of creation of stellar-like objects in the very early universe, from the QCD phase transition till BBN and somewhat later, is studied. It is argued that in the considered process primordial black holes with masses above a few solar masses up to super-heavy ones could be created. This may explain an early quasar creation with evolved chemistry in surrounding medium and the low mass cutoff of the observed black holes. It is also shown that dense primordial stars can be created at the considered epoch. Such stars could later become very early supernovae and in particular high redshift gamma-bursters. In a version of the model some of the created objects can consist of antimatter.