3 papers
astro-ph.CO2026
The onset of the strong backreaction regime in axion inflation, an analytical study
Aditya Kulkarni, Lorenzo Sorbo
Models where an axion-like inflaton is coupled to a gauge field are theoretically well motivated and can display a rich phenomenology. The regime in which the quanta of the…
astro-ph.CO2024
Spectra of fermions produced by a time-dependent axion in the radiation- and matter-dominated Universe
Aditya Kulkarni, Lorenzo Sorbo
Axion-like degrees of freedom generally interact with fermions through a shift symmetric coupling. As a consequence, a time-dependent axion will lead to the generation of fermions…
astro-ph.CO2024
Correlated scalar perturbations and gravitational waves from axion inflation
Sofia P. Corbà, Lorenzo Sorbo
The scalar and tensor fluctuations generated during inflation can be correlated, if arising from the same underlying mechanism. In this paper we investigate such correlation in the…