2021/11/09 by AlHallak, M., AlRakik, A., Chamoun, N. +1 · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences
paper · doi:10.48550/arxiv.2111.05075
We show that upon applying Palatini f(R), characterized by an \a R2-term, within a scenario motivated by a temporal variation of strong coupling constant, then one gets a quadratic kinetic energy. We do not drop this term, but rather study two extreme cases: \a <<1 and \a >>1. In both cases one can generate a kinematically-induced inflationary paradigm. In order to fit the Planck 2018 data, the \a >>1 case, called k-inflation, requires a fine tuning adjustment with non-vanishing non-minimal coupling to gravity parameter ξ, whereas the \a <<1 case, studied in the constant-roll regime, can fit the data for vanishing ξ. The varying strong coupling inflation scenario remains viable when implemented through a warm inflation scenario with or without f(R) gravity.