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hep-ph2026
A multi-axion model of inflation and dark matter
Marcos A. G. Garcia, Hansel Gordillo-Ruiz, Raul Henriquez-Ortiz +1
Models with extra dimensions include a tower of massive states that unavoidably contribute to cosmological dynamics. In particular, after compactification, a higher-dimensional axi…
hep-ph2026
Leptogenesis and Low Reheating Temperatures
Marcos A. G. Garcia, Stephen E. Henrich, Wenqi Ke +1
We study leptogenesis during non-instantaneous reheating in the canonical type-I seesaw framework, with the dominant source of right-handed neutrino (RHN) production being non-ther…
hep-ph2026
Gravitational Waves from Matter Perturbations of Spectator Scalar Fields
Marcos A. G. Garcia, Angel Garcia-Vega, Sarunas Verner
We compute the stochastic gravitational wave background sourced at second order by a spectator scalar field coupled to the inflaton through a portal interaction a…