Antimatter and antistars in the universe and in the Galaxy

TL;DR

This paper explores the potential existence of antimatter stars in the universe and galaxy, deriving new constraints and suggesting that significant antimatter could still be present in the form of baryo-dense stars.

Contribution

It introduces a model extending the Affleck-Dine baryogenesis scenario to predict baryo-dense antimatter stars and derives observational constraints on their abundance.

Findings

New constraints on antimatter object abundance in the galaxy.

Observational data do not exclude significant antimatter presence.

Antimatter could exist as low-mass baryo-dense stars.

Abstract

We consider consequences of hypothetical existence of baryo-dense stars created in the very early universe within an extension of Affleck-Dine scenario of baryogenesis. New constraints on the possible number of compact antimatter objects are derived. The contemporary observational data do not exclude significant amount of antimatter in the Galaxy (and in other galaxies) in the form of the baryo-dense low-massive stars.