Electroweak baryogenesis by primordial black holes in Brans-Dicke modified gravity

Abstract

A successful baryogenesis mechanism is proposed in the cosmological framework of Brans-Dicke modified gravity. Primordial black holes with small mass are produced at the end of the Brans-Dicke field domination era. The Hawking radiation reheats a spherical region around every black hole to a high temperature and the electroweak symmetry is restored there. A domain wall is formed separating the region with the symmetric vacuum from the asymmetric region where electroweak baryogenesis takes place. First order phase transition is not needed. In Brans-Dicke cosmologies black hole accretion can be strong enough to lead to black holes domination which extends the lifetime of black holes and therefore baryogenesis. The analysis of the whole scenario, finally, results in the observed baryon number which can be achieved for a CP-violation angle that is predicted by observationally accepted Two-Higgs Doublet Models. The advantage of our proposed scenario is that naturally provides both black hole domination and more efficient baryogenesis for smaller CP violating angles compared to the same mechanism applied in a FRW cosmological background.

References in corpus (6)

• Constraints on Primordial Black Holes
• Effect of accretion on primordial black holes in Brans-Dicke theory
• Evolution of primordial black holes in Jordan-Brans-Dicke cosmology
• Testing extended Jordan-Brans-Dicke theories with future cosmological observations
• Efficient electroweak baryogenesis by black holes
• Baryogenesis by R-parity violating top quark decays and neutron-antineutron oscillations

Cited by in corpus (11)

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• Swiss-cheese cosmologies with variable $G$ and $\Lambda$ from the renormalization group
• Primordial black holes as cosmic expansion accelerators
• Thermal leptogenesis in anisotropic cosmology
• Dark sector production and baryogenesis from not quite black holes
• Formation and clustering of primordial black holes in Brans-Dicke theory
• Constraining the swiss-cheese IR-fixed point cosmology with cosmic expansion
• Constant-roll inflation and primordial black holes within Barrow entropic framework
• Primordial black hole driven cosmic acceleration
• Strong First Order Phase Transition and $B$ Violation in the Compact 341 Model