Chemical evolution of antimatter domains in early Universe

TL;DR

This paper investigates the chemical evolution and survival conditions of isolated antimatter domains in the early Universe, considering annihilation processes at their boundaries and their potential coexistence with baryonic matter.

Contribution

It introduces a model for the evolution and stability of antimatter domains, addressing their size and boundary annihilation effects in the early Universe.

Findings

Antimatter domains can survive if sufficiently large.

Boundary annihilation significantly affects domain evolution.

Estimated size thresholds for antimatter domain survival.

Abstract

According to modern physics, our Universe is baryon-asymmetric. That phenomenon can not be described in the frameworks of the Standard Model of particle physics. Globally, the Universe consists of baryon matter. However, some scenarios can lead to the existence of local antimatter domains. In the research, the chemical evolution of such an isolated antimatter domain, surrounded by baryonic matter, is studied. The size of the domain is estimated according to the conditions of its survival in baryon surrounding, and the process of annihilation at its border is taken into account.