Matter and antimatter asymmetry in a rainbow universe

In rainbow gravity, the ordinary general relativity (GR) field equations can be modified by a parametric set of equations and thus the cosmology of this scenario may give new sounds about the physics of the early universe. As we know in the radiation -dominated universe the gravitational baryogenesis mechanism (GBM) cannot occur in the GR context. In this regard, by as-suming the flat Friedmann-Robertson-Walker (FRW) metric we study GBM in the rainbow gravity. We obtain that for a rainbow universe filled with radiation, the baryon-to-entropy ratio from the GBM can have a non-zero value. In this work, we study the baryon-to-entropy ratio for the corresponding cosmological models of two suggested dispersion relations and we obtain that in the first case the baryogenesis mechanism occurs and also the results are compatible with the observational constraints while the second case is not consistent with the observational constraints.(c) 2022 Elsevier Inc. All rights reserved.

Automated summary

Rainbow gravity modifies the field equations of general relativity and provides new insights into the physics of the early universe. By studying the gravitational baryogenesis mechanism in the context of rainbow gravity, we find that in a rainbow universe filled with radiation, this mechanism can lead to a non-zero baryon-to-entropy ratio.