http://arxiv.org/abs/2111.05075
We show that upon applying Palatini $f(R)$, characterized by an $\alpha R^2$-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: $\alpha <<1$ and $\alpha >>1$. In both cases one can generate an inflationary paradigm, legitimately called thus a k-inflation, which fits the Planck 2018 data.
M. AlHallak, A. AlRakik, N. Chamoun, et. al.
Wed, 10 Nov 21
7/63
Comments: 10 pages, 2 figures, pdflatex