Axionic Strings, Domain Walls and Baryons

TL;DR

This paper explores the properties of axionic strings and domain walls carrying baryonic charge, linking topological defects to baryon-like particles in models with extra quark flavors and chiral symmetry breaking.

Contribution

It introduces a detailed analysis of charged axionic domain walls and strings, including their construction and properties in models with extra quark flavors and chiral symmetry breaking.

Findings

Charged axionic domain walls can carry baryonic charge.

Explicit construction of charged axionic strings in a specific model.

Discussion of spin, mass scale, and size of these particles.

Abstract

When axionic strings carry a global charge, domain walls bounded by such strings may not be allowed to decay completely. This happens in particular in some models where a composite axion-like particle is the pseudo-Nambu-Goldstone boson of chiral symmetry breaking of an extra quark flavor. In this case the global symmetry is the extra flavor baryonic symmetry. The corresponding axionic domain walls can carry a baryonic charge: they represent the low energy description of the baryons made by the extra quark flavor. Basic properties of these particles, such as spin, mass scale, size are discussed. The corresponding charged axionic strings are explicitly constructed and studied in a specific calculable model.