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Gravitational Baryogenesis
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We show that a gravitational interaction between the derivative of the Ricci scalar curvature and the baryon-number current dynamically breaks CPT in an expanding universe and, combined with baryon-number-violating interactions, can drive the universe towards an equilibrium baryon asymmetry that is observationally acceptable.
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Cited by 2 Pith papers
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Gravitational baryogenesis beyond the spectator approximation
Treating the baryogenesis operator as part of the action yields modified Friedmann and Raychaudhuri equations with an effective Planck mass M_eff² = M_Pl² - 2λ ∇_μ J^μ for the vector-density realization of the current.
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Sign-Locked Gravitational Baryogenesis from Bulk Viscosity and Cosmological Particle Creation
Bulk viscosity deforms the radiation era to produce a sign-definite Ricci scalar derivative, enabling gravitational baryogenesis to match the observed baryon asymmetry η_obs ≈ 8.6×10^{-11} for ξ in 10^{-4}–10^{-3}.
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