A paradigm of warm quintessential inflation and production of relic gravity waves

TL;DR

This paper explores a warm quintessential inflation model where scalar field dissipation influences background and perturbation evolution, producing a detectable blue spectrum of relic gravitational waves constrained by Big Bang Nucleosynthesis.

Contribution

It introduces a novel warm inflation framework with scalar-radiation coupling, analyzing its impact on relic gravity waves and observational constraints.

Findings

Model satisfies observational constraints with weak coupling.

Relic gravity waves exhibit a blue spectrum at high frequencies.

Future detectors could probe the blue tilt of the gravitational wave spectrum.

Abstract

We consider the framework of quintessential inflation in the warm background which is caused by the dissipation of the scalar field energy density into relativistic degrees of freedom. The dissipation process has important consequences for the evolution both at the levels of background as well as perturbation and allows us to easily satisfy the observational constraints.~Our numerical analysis confirms that the model conforms to observational constraints even if the field-radiation coupling strength is weak. In the warm background, we investigate the post inflationary evolution of relic gravity waves produced during inflation whose amplitude is constrained by the Big Bang Nucleosynthesis constraint. Further, we investigate the effect of coupling on the amplitude of gravity waves and obtain the allowed phase space between the model parameters. The mechanism of quintessential inflation gives rise to the blue spectrum of gravitational wave background at high frequencies. We discuss the perspectives of detection of the signal of relic gravity waves by future proposed missions. Improvements of their sensitivities in the high-frequency regime, in the future, might allow us to probe the blue tilt of the spectrum caused by the presence of a kinetic regime in the underlying framework of inflation.