Gravitational leptogenesis in teleparallel and symmetric teleparallel gravities *

In this study, we investigate the possibilities of generating baryon number asymmetry under thermal equilibrium within the frameworks of teleparallel and symmetric teleparallel gravities. Through the derivative couplings of the torsion scalar and the non-metricity scalar to baryons, baryon number asymmetry is 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. However, the gravitational leptogenesis models within both frameworks have the potential to explain the observed baryon-antibaryon asymmetry.

Automated summary

This study investigates the possibilities of generating baryon number asymmetry under thermal equilibrium within the frameworks of teleparallel and symmetric teleparallel gravities, finding that gravitational baryogenesis mechanisms in these frameworks produce a baryon-to-entropy ratio too small to be consistent with observations, but gravitational leptogenesis models within both frameworks have the potential to explain the observed baryon-antibaryon asymmetry.