Matter-Antimatter Asymmetry in the Universe via String-Inspired CPT Violation at Early Eras

TL;DR

This paper explores how string-inspired CPT violation in early universe cosmology could explain matter-antimatter asymmetry through baryogenesis mechanisms involving heavy neutrinos.

Contribution

It proposes a novel scenario where Kalb-Ramond axion-like fields induce CPT violation, leading to baryogenesis in string/brane cosmology models.

Findings

CPT-violating backgrounds can generate matter-antimatter asymmetry.

String-inspired models can naturally incorporate baryogenesis mechanisms.

Early universe conditions favor matter dominance due to these effects.

Abstract

In four-space-time dimensional string/brane theory, obtained either through compactification of the extra spatial dimensions, or by appropriate restriction to brane worlds with three large spatial dimensions, the rich physics potential associated with the presence of non-trivial Kalb-Ramond (KR) axion-like fields has not been fully exploited so far. In this talk, I discuss a scenario whereby such fields produce spontaneous Lorentz- and CPT-violating cosmological backgrounds over which strings propagate, which in the early Universe can lead to Baryogenesis through Leptogenesis in models with heavy right-handed neutrinos.