Gravitational waves from warm inflation in the weak dissipative regime

TL;DR

This paper investigates gravitational waves produced during warm inflation in the weak dissipation regime, showing that this scenario enhances the likelihood of detection by future gravitational-wave observatories.

Contribution

It extends previous models by analyzing the weak dissipation regime of warm inflation and calculating the gravitational-wave spectrum using continuous Bogoliubov coefficients.

Findings

Weak dissipation regime improves detection prospects.

Gravitational-wave spectrum calculated with Bogoliubov formalism.

Comparison shows better detectability than strong dissipation regime.

Abstract

Previous work on the gravitational-wave background generated in a two-scalar-field cosmological model, in which warm inflation and the dark sector are unified within a single framework, has shown that the resulting spectrum could be potentially detectable by planned next-generation gravitational-wave observatories. In this work, we extend this analysis to the weak dissipation regime of warm inflation, highlighting how the features of the inflationary scenario play a crucial role in the production of gravitational waves. The full gravitational-wave energy spectrum is calculated using the formalism of continuous Bogoliubov coefficients. By comparing our results with those obtained in the strong dissipation regime and with the sensitivity curves of future detectors, we find that the weak dissipation regime improves the prospects for observational detection.