# Inflation from fermions with curvature-dependent mass

## TL;DR

This paper proposes a fermion-based inflation model derived from a gravity theory with curvature-dependent fermion mass, successfully reproducing key cosmological phases and aligning with Planck data.

## Contribution

It introduces a novel inflation scenario driven by fermions with curvature-dependent mass from CCGG, demonstrating compatibility with observational data.

## Key findings

- Initial de Sitter phase achieved
- Successful exit to matter and dark energy eras
- Predictions match Planck observations for spectral index and tensor-to-scalar ratio

## Abstract

A model of inflation realization driven by fermions with curvature-dependent mass is studied. Such a term is derived from the Covariant Canonical Gauge Theory of gravity (CCGG) incorporating Dirac fermions. We obtain an initial de Sitter phase followed by a successful exit, and moreover, we acquire the subsequent thermal history, with an effective matter era, followed finally by a dark-energy epoch. This behavior is a result of the effective `weakening' of gravity at early times, due to the decreased curvature-dependent fermion mass. Through the perturbation level, we obtain the scalar spectral index and the tensor-to-scalar ratio, which are in agreement with the Planck observations. The efficiency of inflation from fermions with curvature-dependent mass, at both the background and perturbation level, reveals the capabilities of the scenario and makes it a good candidate for the description of nature.