2025/07/02 by Afzal, Adeela, Roshan, Rishav · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2507.01895
We investigate the possibility of freeze-in dark matter production and baryogenesis via leptogenesis in a ψ'SM model, which is an E6 extension of the Standard Model, featuring a residual U(1)ψ' gauge symmetry. This symmetry arises from a linear combination of U(1)χ and U(1)ψ, both of which are subgroups of the E6. The spontaneous breaking of U(1)ψ' symmetry governs the dynamics of a singlet fermion, which naturally serves as a freeze-in dark matter candidate. The dark matter mass arises from dimension-five operators, and a discrete symmetry ensures their stability. We show that freeze-in production from scalar decay can yield the correct relic abundance for dark matter masses between a few MeV to a few hundred GeV. Simultaneously, heavy right-handed neutrinos generate light neutrino masses via the type-I seesaw and produce the observed baryon asymmetry via leptogenesis.