Unified Model of Neutrino Mass, Oscillations, and Early Universe Cosmology via the SMASH Framework

Ballesteros et al. (2019) propose the SMASH model, which addresses inflation, dark matter (axion), strong CP problem, baryogenesis, and neutrino mass/oscillation in a single extension of the Standard Model. With recent cosmological and oscillation tensions (see Wang et al., Jiang et al.), it’s timely to confront the full SMASH framework with the latest data—including limits on the sum of neutrino masses, CP violation measurements, and direct/indirect axion searches. This research would perform global fits of the full model, exploring how axion physics, seesaw-induced neutrino masses, and Higgs-inflation dynamics interplay in light of the new anomalies. The novelty is in using up-to-date mass and oscillation constraints as key discriminants, potentially ruling out or motivating SMASH variants. If successful, this could provide the first comprehensive, testable theory tying together disparate puzzles in cosmology and particle physics, and guide both laboratory and cosmological probes.

References:

1. Updating neutrino mass constraints with background measurements. Deng Wang, Olga Mena, Eleonora di Valentino, S. Gariazzo (2024). Physical Review D.
2. Neutrino cosmology after DESI: tightest mass upper limits, preference for the normal ordering, and tension with terrestrial observations. Jun-Qian Jiang, William Giaré, S. Gariazzo, M. Dainotti, Eleonora di Valentino, Olga Mena, Davide Pedrotti, S. Santos da Costa, S. Vagnozzi (2024). Journal of Cosmology and Astroparticle Physics.
3. Several Problems in Particle Physics and Cosmology Solved in One SMASH. G. Ballesteros, J. Redondo, A. Ringwald, C. Tamarit (2019). Frontiers in Astronomy and Space Sciences.
4. Updating neutrino mass constraints with background measurements. Deng Wang, Olga Mena, Eleonora di Valentino, S. Gariazzo (2024). Physical Review D.