Warm -exponential inflation and the swampland conjectures

F. B. M. dos Santos; R. Silva; S. Santos da Costa; M. Benetti; J. S. Alcaniz

doi:10.1140/epjc/s10052-023-11329-w

2022 Impact factor 4.4

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 178
https://doi.org/10.1140/epjc/s10052-023-11329-w

Regular Article - Theoretical Physics

Warm -exponential inflation and the swampland conjectures

F. B. M. dos Santos¹^a, R. Silva¹^,2, S. Santos da Costa³, M. Benetti⁴^,5 and J. S. Alcaniz⁶

¹ Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970, Natal, RN, Brazil
² Departamento de Física, Universidade do Estado do Rio Grande do Norte, 59610-210, Mossoró, Brazil
³ Istituto Nazionale di Fisica Nucleare (INFN) Sezione di Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy
⁴ Scuola Superiore Meridionale, Largo San Marcellino 10, 80138, Naples, Italy
⁵ Istituto Nazionale di Fisica Nucleare (INFN) Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Edificio G, Via Cinthia, 80126, Naples, Italy
⁶ Departamento de Astronomia, Observatório Nacional, Rua General José Cristino, 20921-400, Rio de Janeiro, RJ, Brazil

^a felipe.santos.091@ufrn.edu.br

Received: 3 December 2022
Accepted: 12 February 2023
Published online: 24 February 2023

Abstract

We investigate theoretical and observational aspects of a warm inflation scenario driven by the -exponential potential, which generalizes the well-known power law inflation. In such a scenario, the decay of the inflaton field into radiation happens during the inflationary phase. In our study, we consider a dissipation coefficient () with cubic dependence on the temperature (T) and investigate the consequences in the inflationary dynamics, focusing on the impact on the spectral index , its running and tensor-to-scalar ratio r. We find it possible to realize inflation in agreement with current cosmic microwave background data in weak and strong dissipation regimes. We also investigate theoretical aspects of the model in light of the swampland conjectures, as warm inflation in the strong dissipation regime has been known as a way to satisfy the three conditions currently discussed in the literature. We find that when , the -exponential model can be accommodated into the conjectures.

© The Author(s) 2023

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