Continuous Bogoliubov formalism for gravitational-wave generation in a unified dark sector warm inflation

TL;DR

This paper reviews gravitational-wave production in a two-scalar-field warm inflation model that unifies dark sector physics, showing the spectrum's robustness and potential detectability by future experiments.

Contribution

It introduces a unified two-field warm inflation framework and demonstrates the spectrum's independence from initial conditions, extending previous results.

Findings

The gravitational-wave spectrum may be detectable by future experiments.

The spectrum is largely independent of the initial condition of the scalar field.

The model unifies warm inflation with the dark sector in a single theoretical setup.

Abstract

In this work, we review gravitational-wave generation in a two-scalar-field cosmological model. The framework relies on a two-field scenario in which warm inflation is unified with the dark sector within a single theoretical description. It has recently been shown that this setup leads to a gravitational-wave spectrum potentially detectable by future experiments. Here we also demonstrate that the resulting spectrum is largely independent of the $\phi$ field initial condition, thereby extending previous findings.