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- Title
Palatini f (R) Gravity and Variants of k-/Constant Roll/Warm Inflation within Variation of Strong Coupling Scenario.
- Authors
AlHallak, Mahmoud; AlRakik, Amer; Chamoun, Nidal; El-Daher, Moustafa Sayem
- Abstract
We show that upon applying Palatini f (R) , characterized by an α R 2 term, within a scenario motivated by a temporal variation of strong coupling constant, then one obtains a quadratic kinetic energy. We do not drop this term, but rather study two extreme cases: α < < 1 and α > > 1 . In both cases, one can generate a kinematically-induced inflationary paradigm. In order to fit the Planck 2018 data, the α > > 1 case, called k-inflation, requires a fine tuning adjustment with nonvanishing nonminimal coupling to gravity parameter ξ , whereas the α < < 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.
- Subjects
STOPPING power (Nuclear physics); COUPLING constants; GENERAL relativity (Physics); DEGREES of freedom; LAGRANGE equations
- Publication
Universe (2218-1997), 2022, Vol 8, Issue 2, pN.PAG
- ISSN
2218-1997
- Publication type
Article
- DOI
10.3390/universe8020126