TL;DR
This paper examines how the time variation of the equation of state parameter in an expanding universe influences gravitational baryogenesis, which is driven by the coupling between Ricci scalar curvature and baryon current.
Contribution
It analyzes the impact of the evolving equation of state on baryon asymmetry generated through Ricci scalar coupling in the early universe.
Findings
Time dependence of the equation of state affects baryon asymmetry magnitude
Coupling between Ricci scalar and baryon current can dynamically break CPT
Results suggest conditions for successful baryogenesis depend on universe expansion dynamics
Abstract
The coupling between Ricci scalar curvature and the baryon number current dynamically breaks CPT in an expanding universe and leads to baryon asymmetry. We study the effect of time dependence of equation of state parameter of the FRW universe on this asymmetry.
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