A generalized method of constraining Warm Inflation with CMB data

TL;DR

This paper introduces a new generalized method to convert Warm Inflation power spectra into a form suitable for MCMC analysis, bypassing the slow-roll approximation and applicable to complex models.

Contribution

A novel methodology to directly model Warm Inflation power spectra as functions of wavenumber without slow-roll assumptions, facilitating cosmological data analysis.

Findings

Efficient transformation of WI spectra for MCMC analysis.

Applicable to complex WI models with intricate potentials and dissipation.

Enables rigorous testing of WI models against CMB data.

Abstract

A thorough MCMC analysis of any inflationary model against the current cosmological data is essential for assessing the validity of such a model as a viable inflationary model. Warm Inflation, producing both thermal and quantum fluctuations, yield a complex form of scalar power spectrum, which, in general, cannot be directly written as a function of the comoving wavenumber $k$, an essential step to incorporate the primordial spectra into CAMB to do an MCMC analysis through CosmoMC/Cobaya. In this paper, we devised an efficient generalized methodology to mould the WI power spectra as a function of $k$, without the need of slow-roll approximation of the inflationary dynamics. The methodology is directly applicable to any Warm Inflation model, including the ones with complex forms of the dissipative coefficient and the inflaton potential.