Helicitogenesis: WIMPy baryogenesis with sterile neutrinos and other realizations

Abstract

We propose a mechanism for baryogenesis from particle decays or annihilations that can work at the TeV scale. Some heavy particles annihilate or decay into a heavy sterile neutrino N (with M > 0.5 TeV) and a "light" one ν(with m << 100 GeV), generating an asymmetry among the two helicity degrees of freedom of ν. This asymmetry is partially transferred to Standard Model leptons via fast Yukawa interactions and reprocessed into a baryon asymmetry by the electroweak sphalerons. We illustrate this mechanism in a WIMPy baryogenesis model where the helicity asymmetry is generated in the annihilation of dark matter. This model connects the baryon asymmetry, dark matter, and neutrino masses. Moreover it also complements previous studies on general requirements for baryogenesis from dark matter annihilation. Finally we discuss other possible realizations of this helicitogenesis mechanism.

19 pages - 1 figure - Version 2: several clarifications have been added

References in corpus (2)

• Robust Cosmological Bounds on Neutrinos and their Combination with Oscillation Results
• Electroweak Phase Transition and LHC Signatures in the Singlet Majoron Model

Cited by in corpus (10)

• Non-thermal Origin of Asymmetric Dark Matter from Inflaton and Primordial Black Holes
• Gravitational wave signatures of PBH-generated baryon-dark matter coincidence
• Large Neutrino Asymmetry from TeV Scale Leptogenesis
• WIMP Cogenesis for Asymmetric Dark Matter and the Baryon Asymmetry
• Affleck-Dine Cogenesis of Baryon and Dark Matter
• WIMPy Leptogenesis in Non-Standard Cosmologies
• Dark Freeze-out Cogenesis
• Leptogenesis, Dark Matter and Gravitational Waves from Discrete Symmetry Breaking
• Two-component Dark Matter and low scale Thermal Leptogenesis
• Cogenesis of visible and dark matter in type-I Dirac seesaw