53 citations · 268 across the 10 of their papers we have counts for
7 papers · 1 filter
Axion Inflation with a Massive Abelian Gauge Field
Ricardo Z. Ferreira, Alessio Notari, José Jaime Terente Díaz
An axial coupling between an inflaton and an Abelian gauge field can trigger the tachyonic amplification of one gauge-field helicity. For a massless vector, modes with physical mom…
CMB and Lyman- constraints on dark matter decays to photons
Francesco Capozzi, Ricardo Z. Ferreira, Laura Lopez-Honorez +1
Dark matter energy injection in the early universe modifies both the ionization history and the temperature of the intergalactic medium. In this work, we improve the CMB bounds on…
Non-Gaussianities in models of inflation with large and negative entropic masses
Ricardo Z. Ferreira
Models of inflation where the entropic directions have large and negative masses can be well described by a single-field EFT with an imaginary sound speed . Amon…
Late time transitions in the quintessence field and the tension
Eleonora Di Valentino, Ricardo Z. Ferreira, Luca Visinelli +1
We consider a quintessence field which transitions from a matter-like to a cosmological constant behavior between recombination and the present time. We aim at easing the tension i…
Natural Inflation with a periodic non-minimal coupling
Ricardo Z. Ferreira, Alessio Notari, Guillem Simeon
Natural inflation is an attractive model for primordial inflation, since the potential for the inflaton is of the pseudo Nambu-Goldstone form, , and so is…
Thermalized axion inflation: natural and monomial inflation with small
Ricardo Z. Ferreira, Alessio Notari
A safe way to reheat the universe, in models of natural and quadratic inflation, is through shift symmetric couplings between the inflaton and the Standard Model (SM), since th…