Baryogenesis in Lorentz-violating gravity theories

Abstract

Lorentz-violating theories of gravity typically contain constrained vector fields. We show that the lowest-order coupling of such vectors to $\mathrm{U}(1)$-symmetric scalars can naturally give rise to baryogenesis in a manner akin to the Affleck-Dine mechanism. We calculate the cosmology of this new mechanism, demonstrating that a net $B-L$ can be generated in the early Universe, and that the resulting baryon-to-photon ratio matches that which is presently observed. We discuss constraints on the model using solar system and astrophysical tests of Lorentz violation in the gravity sector. Generic Lorentz-violating theories can give rise to the observed matter-antimatter asymmetry without violating any current bounds.

Five pages, two figures, submitted to PLB

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• Gravitational Baryogenesis in Ho$\check{r}$ava-Lifshitz gravity
• Baryogenesis via Gravitational Spontaneous Symmetry Breaking
• On Lorentz invariant complex scalar fields
• More about Q-ball with elliptical orbit
• Varying constants driven baryogenesis
• Asymmetric particle-antiparticle Dirac equation: first quantization