Inflation in a scalar-vector gravity theory
Abstract
We study the possibility that inflation is driven by a scalar field together with a vector field minimally coupled to gravity. By assuming an effective potential that incorporates both fields into the action, we explore two distinct scenarios: one where the fields interact and another where they do not. In this context, we find different analytical solutions to the background scalar-vector fields dynamics during the inflationary scenario considering the slow-roll approximation. Besides, general conditions required for these models of two fields to be realizable are determined and discussed. From the cosmological perturbations, we consider a local field rotation, and then we determine these perturbations (scalar and tensor) during inflation, and we also utilize recent cosmological observations for constraining the parameter-space in these scalar-vector inflationary models.
Cite
@article{arxiv.2405.14653,
title = {Inflation in a scalar-vector gravity theory},
author = {Manuel Gonzalez-Espinoza and Ramon Herrera},
journal= {arXiv preprint arXiv:2405.14653},
year = {2024}
}