Primordial antimatter in the contemporary universe

TL;DR

This paper explores the possibility of antimatter regions and objects existing in the current universe due to baryogenesis scenarios, discussing potential observable signatures of such antimatter.

Contribution

It introduces the concept that antimatter could form compact objects and regions in the universe, providing a new perspective on dark matter composition.

Findings

Antimatter lumps may exist in the universe's neighborhood.

Compact antimatter objects could contribute to dark matter.

Observable signatures of antimatter regions are discussed.

Abstract

In some baryogenesis scenarios, the universe acquires a non-vanishing average baryonic charge, but the baryon to photon ratio is not spatially constant and can be even negative in some space regions. This allows for existence of lumps of antimatter in our neighborhood and the possibility that very compact antimatter objects make a part of cosmological dark matter. Here I discuss the peculiar signatures which may be observed in a near future.