# Cosmological solutions in generalized hybrid metric-Palatini gravity

## TL;DR

This paper derives exact FLRW cosmological solutions within a generalized hybrid metric-Palatini gravity framework, revealing conditions for exponential expansion even with non-vacuum matter content.

## Contribution

It introduces a scalar-tensor approach to find exact solutions in a generalized hybrid gravity theory, expanding understanding of possible cosmological evolutions.

## Key findings

- Exponential expansion solutions for flat universes with matter.
- Conditions on actions for generating these solutions.
- Scalar-tensor representation simplifies solution derivation.

## Abstract

We construct exact solutions representing a Friedmann-Lema\^itre-Robsertson-Walker (FLRW) universe in a generalized hybrid metric-Palatini theory. By writing the gravitational action in a scalar-tensor representation, the new solutions are obtained by either making an ansatz on the scale factor or on the effective potential. Among other relevant results, we show that it is possible to obtain exponentially expanding solutions for flat universes even when the cosmology is not purely vacuum. We then derive the classes of actions for the original theory which generate these solutions.