Gravitational leptogenesis in teleparallel and symmetric teleparallel gravities

TL;DR

This paper explores how teleparallel and symmetric teleparallel gravities can generate baryon asymmetry through derivative couplings, with leptogenesis models potentially explaining observed matter-antimatter imbalance.

Contribution

It investigates gravitational leptogenesis in these alternative gravity frameworks, showing potential to account for baryon asymmetry.

Findings

Baryon asymmetry can be generated in thermal equilibrium in these models.

Produced baryon-to-entropy ratio is too small for baryogenesis.

Leptogenesis models within these frameworks can explain observed asymmetry.

Abstract

In this paper, we consider the possibilities of generating baryon number asymmetry in thermal equilibrium within the frameworks of teleparallel and symmetric teleparallel gravities. Through the derivative couplings of the torsion scalar or the non-metricity scalar to baryons, the baryon number asymmetry is indeed produced in the radiation dominated epoch. For gravitational baryogenesis mechanisms in these two frameworks, the produced baryon-to-entropy ratio is too small to be consistent with observations. But the gravitational leptogenesis models within both frameworks have the possibilities to interpret the observed baryon-antibaryon asymmetry.