Inflation in Metric-Affine Quadratic Gravity

TL;DR

This paper explores a metric-affine gravity model with quadratic curvature terms coupled to a scalar field, resulting in an inflationary theory compatible with observations and capable of adjusting the tensor-to-scalar ratio.

Contribution

It introduces a novel inflationary model within metric-affine gravity featuring a non-minimal coupling and an extra pseudoscalar degree of freedom, analyzing its observational viability.

Findings

Inflationary predictions align with current observational bounds.

The model allows for an increased tensor-to-scalar ratio.

The spectral index varies depending on parameters.

Abstract

In the general framework of Metric-Affine theories of gravity, where the metric and the connection are independent variables, we consider actions quadratic in the Ricci scalar curvature and the Holst invariant (the contraction of the Riemann curvature with the Levi-Civita antisymmetric tensor) coupled non-minimally to a scalar field. We study the profile of the equivalent effective metric theory, featuring an extra dynamical pseudoscalar degree of freedom, and show that it reduces to an effective single-field inflationary model. We analyze in detail the inflationary predictions and find that they fall within the latest observational bounds for a wide range of parameters, allowing for an increase in the tensor-to-scalar ratio. The spectral index can either decrease or increase depending on the position in parameter space.