$F(\varphi )T$-Gravity and Inflationary Natural Model

Abstract

By applying a particular kind of modified gravity, we study the inflation. Precisely, we extend our investigations beyond the Einstein's gravity to explore the Natural inflation model via the term $F(\varphi )T$. We compute the inflation dynamics to derive the slow-roll parameters, i.e., the tensor-to-scalar ratio ``$r$'' and the scalar spectral index ``$n_s$''. This modified form of the gravity yields not only the predictions of the original models but also better-fitting with the Planck/BICEP/Keck data.

17 pages, LaTex2e, 1 figure

References in corpus (7)

• f(R,T) gravity
• Dark torsion as the cosmic speed-up
• Modified teleparallel gravity: inflation without inflaton
• Extra force in $f(R)$ modified theories of gravity
• The Unity of Cosmological Attractors
• Planck, LHC, and $\alpha$-attractors
• Cosmological implications of modified gravity induced by quantum metric fluctuations