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}.
Mandel, Gravitational Baryogenesis from Entropy Production and Parity Violation: A Unified Framework, arXiv:2601.11690 [hep-ph, gr-qc]
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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}.