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.

arXiv comment19 pages - 1 figure - Version 2: several clarifications have been added

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• A Review of WIMP Baryogenesis Mechanisms
• Gravitational wave signatures of PBH-generated baryon-dark matter coincidence
• Two-component Dark Matter with co-genesis of Baryon Asymmetry of the Universe
• Asymmetric Dark Matter and CP Violating Scatterings in a UV Complete Model
• Hot Leptogenesis from Thermal Dark Matter
• 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
• Sharing but not Caring: Dark Matter and the Baryon Asymmetry of the Universe
• Leptogenesis, Dark Matter and Gravitational Waves from Discrete Symmetry Breaking
• Non-thermal WIMP baryogenesis
• Quark Seesaw, Dark $U(1)$ symmetry and Baryon-Dark Matter Coincidence
• Two-component Dark Matter and low scale Thermal Leptogenesis
• Cogenesis of visible and dark matter in type-I Dirac seesaw