2017/09/30 by Maria Ramos, M. P. L. P. Ramos, Jorge Páramos +1 · 43 citations
Earth and Planetary Sciences · Physics and Astronomy · #Asymmetry #Baryogenesis #Baryon #Baryon asymmetry #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Curvature #Geometry #Geophysics and Gravity Measurements #Gravitation #Mathematical physics #Particle physics #Physics #Quantum mechanics #Scalar curvature #gr-qc
paper · pdf · doi:10.1103/physrevd.96.104024
published in Physical review. D/Physical review. D. 96(10) (American Physical Society) · 9 pages, 5 figures
openalex created_date 2017/09/25 · openalex publication_date 2017/11/16 · arxiv created 2017/11/18 · arxiv updated 2017/11/22 · openalex updated_date 2026/08/05
We generalize the mechanism for gravitational baryogensis in the context of f(R) theories of gravity, including a nonminimal coupling between curvature and matter. In these models, the baryon asymmetry is generated through an effective coupling between the Ricci scalar curvature and the net baryon current that dynamically breaks Charge conjugation, parity and time reversal (CPT) invariance. We study the combinations of characteristic mass scales and exponents for both nontrivial functions present in the modified action functional and establish the allowed region for these parameters: we find that very small deviations from general relativity are consistent with the observed baryon asymmetry and lead to temperatures compatible with the subsequent formation of the primordial abundances of light elements. In particular, we show the viability of a power-law nonminimal coupling function f2(R)\ensuremath∼Rn with 0<n\ensuremath\lesssim0.078 and determine its characteristic curvature scale.