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The authors thank Pasquale Serpico for useful discussions and Rudnei Ramos for comments. APR thanks Arturo de Giorgi for discussions about the quantization of stochastic scalar fields. The work of GB has been funded by a Contrato de Atraccion de Talento (Modalidad 1) de la Comunidad de Madrid (Spain) , 2017-T1/TIC-5520 and 2021-5A/TIC-20957. This work is partially supported by PID2021-124704NB-I00 funded by MCIN/AEI/10.13039/501100011033 and by ERDF A way of making Europe. This work is partially supported as well by the Spanish Research Agency (Agencia Estatal de Investigacion) through the Grant IFT Centro de Excelencia Severo Ochoa No CEX2020-001007-S, funded by MCIN/AEI/10.13039/501100011033. APR has been supported by Universidad Autonoma de Madrid with a PhD contract contrato predoctoral para formacion de personal investigador (FPI) , call of 2021. MP acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy - EXC 2121 "Quantum Universe" - 390833306. MP thanks the IFT UAM-CSIC for hospitality during part of the realization of this work.

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Monomial warm inflation revisited

Publicado en:JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. 2024 (3): 003- - 2024-03-01 2024(3), DOI: 10.1088/1475-7516/2024/03/003

Autores: Ballesteros, G.; Pérez Rodríguez, A. ; Pierre, M.

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Resumen

We revisit the idea that the inflaton may have dissipated part of its energy into a thermal bath during inflation, considering monomial inflationary potentials and three different forms of dissipation rate. Using a numerical Fokker -Planck approach to describe the stochastic dynamics of inflationary fluctuations, we confront this scenario with current bounds on the spectrum of curvature fluctuations and primordial gravitational waves. We also obtain purely analytical approximations that improve over previously used ones in the small dissipation regime for the amplitude of the spectrum and its tilt. We show that only our numerical Fokker -Planck method is accurate, fast and precise enough to test these models against current data. We advocate its use in future studies of warm inflation. We also apply the stochastic inflation formalism to this scenario, finding that the resulting spectrum is the same as the one obtained with standard perturbation theory. We discuss the origin and convenience of using a commonly implemented large thermal correction to the primordial spectrum and the implications of such a term for a specific scenario. Improved bounds on the scalar spectral index will further constrain warm inflation in the near future.

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