Electromagnetic Dirac Cogenesis

2025/07/15 by Debasish Borah, Borah, Debasish, Arnab Dasgupta +1 · 1 citation
Mathematics · #Algebraic and Geometric Analysis #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · pdf · doi:10.48550/arxiv.2507.11607

openalex publication_date 2025/07/15 · openalex created_date 2025/10/18 · openalex updated_date 2026/07/28

Abstract

We propose a novel cogenesis mechanism by utilising the two-body decay of heavy vector-like fermions to dark matter (DM) χ and right chiral part of light Dirac neutrino ν_R via the electromagnetic dipole operator. This leads to generation of asymmetry in dark fermion χ as well as ν_R with the latter getting transferred to left-handed lepton doublets via Yukawa interactions with a neutrinophilic Higgs doublet. While lepton asymmetry is converted into baryon asymmetry of the Universe via electroweak sphalerons, the dark fermion asymmetry results in asymmetric dark matter. Since CP asymmetries in lepton and dark sector are equal and opposite due to net lepton number conservation, DM mass is restricted to a fixed value ∼ O(1) GeV. Long-lived nature of DM keeps indirect detection prospects at gamma-ray telescopes alive while thermalised light Dirac neutrinos lead to observable dark radiation at cosmic microwave background (CMB) experiments. Heavy vector-like fermions can be probed at terrestrial experiments via their electromagnetic dipole interactions.

Citations

• Filtered cogenesis of PBH dark matter and baryons
• Electromagnetic leptogenesis with light-heavy sterile neutrinos
• Scale of Dirac leptogenesis and left-right symmetry in the light of recent PTA results
• Baryon asymmetry from dark matter decay in the vicinity of a phase transition
• Baryon asymmetry from dark matter decay
• LIGO-VIRGO constraints on dark matter and leptogenesis triggered by a first order phase transition at high scale
• Exotic energy injection in the early universe II: CMB spectral distortions and constraints on light dark matter
• CMB-S4 Science Case, Reference Design, and Project Plan
• Relic neutrino decoupling including flavour oscillations
• Review of Particle Physics
• Supersymmetric Dark Matter

Cited by

• Electromagnetic Leptogenesis -- an EFT-Consistent Analysis via Wilson Coefficients. Part I. Low-Scale, Non-Resonant Regime

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