Gravitational Baryogenesis in Rainbow Gauss-Bonnet gravity
arXiv:2607.25491
The paper investigates how combining rainbow gravity with a four‑dimensional Einstein–Gauss–Bonnet model can generate a non‑zero time derivative of the Ricci scalar during the radiation era, leading to a viable baryon‑to‑entropy asymmetry.
Abstract
The gravitational baryogenesis is studied in regularized four dimensional Einstein Gauss Bonnet model with rainbow gravity corrections. This combined framework generates a non vanishing time derivative of the Ricci scalar even during radiation domination era. We derive analytical expressions for the baryon to entropy ratio in both the high curvature and perturbative regimes. The Gauss Bonnet contribution produces nonzero asymmetry precisely at radiation era, where the Einstein Hilbert contribution vanishes. Numerical analysis identifies viable parameter spaces reproducing the observed baryon to entropy ratio, compatible with observations.
24 pages, 7 figures