Gravitational waves during inflation in presence of a decaying cosmological parameter from a 5D vacuum theory of gravity

TL;DR

This paper investigates the generation of gravitational waves during inflation within a 5D vacuum framework, analyzing scenarios with both constant and decreasing cosmological parameters to understand their effects on wave production.

Contribution

It introduces a 5D vacuum model to study gravitational waves during inflation with a decaying cosmological parameter, extending previous 4D analyses.

Findings

Gravitational waves are generated during inflation in the 5D vacuum model.

The behavior of waves differs between constant and decreasing cosmological parameters.

The model provides insights into the influence of higher-dimensional geometry on early universe phenomena.

Abstract

We study gravitational waves generated during the inflationary epoch in presence of a decaying cosmological parameter on a 5D geometrical background which is Riemann flat. Two examples are considered, one with a constant cosmological parameter and the second with a decreasing one.