Slow-roll inflation in $f(T,\mathcal{T})$ modified gravity

Abstract

In this article, we explore the concept of cosmological inflation within the framework of the $f(T,\mathcal{T})$ theory of gravity, where $f$ is a general function of the Torsion scalar $T$ and the trace, $\mathcal{T}$, of the energy-momentum tensor. It is assumed that the conditions of slow-roll inflation are applicable in$f(T,\mathcal{T})$ gravity. To determine different observables related to inflation, such as the tensor-to-scalar ratio $r$, scalar spectral index $n_s$, spectral index ${\alpha }_s$, and tensor spectral index $n_t$, the Hubble slow-roll parameters are utilized for a particular model of $f(T,\mathcal{T})$. Lastly, an assessment has been carried out to determine the feasibility of the models by conducting a numerical analysis of the parameters. The findings indicate that it is feasible to achieve compatibility with the observational measurements of slow-roll parameters by utilizing different values of the free parameters.

Chinese Physics C published version

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