Cosmological inflation driven by a scalar torsion function

TL;DR

This paper proposes a cosmological inflation model driven by a scalar torsion function, which aligns with observed spectral indices and unifies early universe inflation with late-time acceleration.

Contribution

It introduces a novel torsion-based inflation model that also explains current cosmic acceleration, suggesting a unified approach to different universe phases.

Findings

Spectral index in the range 0.92 to 0.97 achieved

Analytical solutions generalize matter-dominated universe

Torsion function explains late-time acceleration

Abstract

A viable model for inflation driven by a torsion function in a Friedmann background is presented. The scalar spectral index in the interval $0.92\lesssim n_{s}\lesssim 0.97$ is obtained in order to satisfy the initial conditions for inflation. The post inflationary phase is also studied, and the analytical solutions obtained for scale factor and energy density generalizes that ones for a matter dominated universe, indicating just a small deviation from the standard model evolution. The same kind of torsion function used also describes satisfactorily the recent acceleration of the universe, which could indicate a possible unification of different phases, apart form specific constants.