Cosmological Bounds on Scotogenic Model with Asymmetric Mediator

2025/12/16 by Kento Asai, Asai, Kento, Seishi Enomoto +5
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena

paper · pdf · doi:10.48550/arxiv.2512.14271

Abstract

We study cosmological constraints on the asymmetric mediator scenario, a variant of the scotogenic model that addresses the origins of neutrino masses, dark matter (DM), and the baryon asymmetry. An SU(2)_L doublet scalar η mediates between the visible and dark sectors, while a singlet scalar σ serves as the DM candidate. We evaluate the DM relic abundance by solving the Boltzmann equations including η decay and scattering processes prior to the freeze-out of the η asymmetry, and show Big Bang nucleosynthesis constraints from late-time η decays. Combining the DM abundance and BBN bounds, we find the favored parameter space of this model, for instance, the mediator masses of m_η\lesssim O(10) TeV.

Citations

• Low-scale leptogenesis in the scotogenic model: spectator processes and benchmark points
• Cogenesis of visible and dark matter in a scotogenic model
• Boltzmann equation and its cosmological applications
• Complex Spinors and Unified Theories
• NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS

Related

• Baryon asymmetry from dark matter decay in the vicinity of a phase transition
• Cogenesis of visible and dark matter in a scotogenic model
• Two-component Dark Matter and low scale Thermal Leptogenesis
• The Scotogenic Model with Two Inert Doublets: Parameters Space and Electroweak Precision Tests
• Non-standard cosmological scenarios, Sommerfeld enhancement and asymmetric dark matter