A little theory of everything, with heavy neutral leptons

Abstract

Recently a new model of "Affleck-Dine inflation" was presented, that produces the baryon asymmetry from a complex inflaton carrying baryon number, while being consistent with constraints from the cosmic microwave background. We adapt this model such that the inflaton carries lepton number, and communicates the lepton asymmetry to the standard model baryons via quasi-Dirac heavy neutral leptons (HNLs) and sphalerons. One of these HNLs, with mass $\lesssim 4.5$GeV, can be (partially) asymmetric dark matter (DM), whose asymmetry is determined by that of the baryons. Its stability is directly related to the vanishing of the lightest neutrino mass. Neutrino masses are generated by integrating out heavy sterile neutrinos whose mass is above the inflation scale. The model provides an economical origin for all of the major ingredients missing from the standard model: inflation, baryogenesis, neutrino masses, and dark matter. The HNLs can be probed in fixed-target experiments like SHiP, possibly manifesting $N$-$\bar{N}$ oscillations. A light singlet scalar, needed for depleting the DM symmetric component, can be discovered in beam dump experiments and searches for rare decays, possibly explaining anomalous events recently observed by the KOTO collaboration. The DM HNL is strongly constrained by direct searches, and could have a cosmologically interesting self-interaction cross section.

arXiv comment34 pages, 7 figures; v2: improved version with discussion of DM indirect detection, additional HNL decay channels, references added; v3: added constraints from rare LFV decays

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Cited by in corpus (32)

• The Forward Physics Facility: Sites, Experiments, and Physics Potential
• The Present and Future Status of Heavy Neutral Leptons
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• Explaining $(g-2{)}_{\mu ,e}$, the KOTO anomaly and the MiniBooNE excess in an extended Higgs model with sterile neutrinos
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• Looking forward to test the KOTO anomaly with FASER
• Affleck-Dine Baryogenesis with Observable Neutron-Anti-Neutron Oscillation
• A Minimal Approach to Baryogenesis via Affleck-Dine and Inflaton Mass Terms
• Pair production of dark particles in meson decays
• Heavy Neutral Leptons at the Electron-Ion Collider
• Affleck-Dine Cogenesis of Baryon and Dark Matter
• Could compact stars in globular clusters constrain dark matter?
• Inflection-point Inflation and Dark Matter Redux
• Evading the Grossman-Nir bound with $\Delta I=3/2$ new physics
• Neutrino Mass from Affleck-Dine Leptogenesis and WIMP Dark Matter
• Three Exceptions to the Grossman-Nir Bound
• Freeze-In of radiative keV-scale neutrino dark matter from a new $\text{U}(1{)}_{\text{B-L}}$
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• Stochastic Baryogenesis
• Baryogenesis and Dark Matter in Multiple Hidden Sectors
• Q-balls in Non-Minimally Coupled Palatini Inflation and their Implications for Cosmology
• Cosmological implications of the KOTO excess
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