Testing Dirac leptogenesis with the cosmic microwave background and proton decay

Abstract

The nature of neutrino masses and the matter-antimatter asymmetry of our universe are two of the most important open problems in particle physics today and are notoriously difficult to test with current technology. Dirac neutrinos offer a solution through a leptogenesis mechanism that hinges on the smallness of neutrino masses and resultant non-thermalization of the right-handed neutrino partners in the early universe. We thoroughly explore possible realizations of this Dirac leptogenesis idea, revealing new windows for highly efficient asymmetry generation. In many of them, the number of relativistic degrees of freedom, $N_{\text{eff}}$, is severely enhanced compared to standard cosmology and offers a novel handle to constrain Dirac leptogenesis with upcoming measurements of the cosmic microwave background. Realizations involving leptoquarks even allow for low-scale post-sphaleron baryogenesis and predict proton decay. These novel aspects render Dirac leptogenesis surprisingly testable.

arXiv comment11 pages; v3: more details and modified title, matches PRD version

References in corpus (28)

• Leptogenesis
• Towards a complete theory of thermal leptogenesis in the SM and MSSM
• Cosmology and Astrophysics of Minimal Dark Matter
• Relic neutrino decoupling with flavour oscillations revisited
• Leptogenesis with Dirac Neutrinos
• Unbroken B-L Symmetry
• Protecting the Primordial Baryon Asymmetry From Erasure by Sphalerons
• Search for Proton Decay via $p\to \nu K^{+}$ using 260 kiloton$\cdot$year data of Super-Kamiokande
• Realistic Dirac Leptogenesis
• Prospects for Beyond the Standard Model Physics Searches at the Deep Underground Neutrino Experiment
• Cold keV dark matter from decays and scatterings
• Efficiency and maximal CP-asymmetry of scalar triplet leptogenesis
• Lyman-$\alpha$ constraints on freeze-in and superWIMPs
• Leptogenesis: beyond the minimal type I seesaw scenario
• Observing Dirac neutrinos in the cosmic microwave background
• Neutrinoless Quadruple Beta Decay
• Inclusive Nucleon Decay Searches as a Frontier of Baryon Number Violation
• Dirac neutrinos and $N_{\mathrm{eff}}$ II: the freeze-in case
• Cosmological Abundance of Colored Relics
• Non-thermal cosmic neutrino background
• Leptogenesis with Lepton-Number-Violating Dirac Neutrinos
• Cloistered Baryogenesis
• A Sommerfeld Toolbox for Colored Dark Sectors
• Unraveling the Dirac Neutrino with Cosmological and Terrestrial Detectors
• Proton decay and light sterile neutrinos
• New ways to TeV scale leptogenesis
• Freeze-in Dirac neutrinogenesis: thermal leptonic CP asymmetry
• S.M.A.S.H.E.D.: Standard Model Axion Seesaw Higgs Inflation Extended for Dirac Neutrinos

Cited by in corpus (8)

• Excited bound states and their role in dark matter production
• Signatures of Bulk Neutrinos in the Early Universe
• Dirac leptogenesis from asymmetry wash-in via scatterings
• Nucleon Decays into Light New Particles in Neutrino Detectors
• Leptogenesis During an Era of Early SU(2) Confinement
• Dirac leptogenesis via scatterings
• BSFfast: Rapid computation of bound-state effects on annihilation in the early Universe
• Cogenesis of visible and dark matter in type-I Dirac seesaw