Reconstructing f(T) gravity and exploring the torsion driven warm inflationary cosmology

Ghosh, Moli; Aktaş, Can; Chattopadhyay, Surajit

doi:10.1140/epjc/s10052-025-14461-x

Reconstructing f(T) gravity and exploring the torsion driven warm inflationary cosmology

Journal Article · Wed Jul 02 00:00:00 EDT 2025 · European Physical Journal. C, Particles and Fields (Online)

DOI:https://doi.org/10.1140/epjc/s10052-025-14461-x· OSTI ID:3015520

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Amity University, Kolkata (India); Mrinalini Datta Mahavidyapith, Kolkata (India)
Çanakkale Onsekiz Mart University (Turkey)
Amity University, Kolkata (India)

The current paper reports an investigation of a warm inflationary scenario in the context of f(T) gravity for a spatially flat FLRW universe. In our model, inflation is driven purely by the torsional sector of f(T) gravity, without introducing any additional scalar fields. We focus on the high dissipative regime (R >> 1), reconstruct the Hubble parameter as a function of the e-folding number N, and derive the slow-roll parameters ε₁(N) and ε₂(N). The study has encapsulated the dynamics of inflation and its duration under strong dissipation. The dissipative coefficient Γ is modeled with a temperature-dependent power-law form, linking the inflationary dynamics to thermal corrections and the particle content of the early universe. The analysis has affirmed that the torsion-induced energy density ρ_T successfully transitions to radiation energy density ρ_rad, facilitating a graceful exit from inflation. Finally, we have validated our model by comparing the scalar spectral index and tensor-to-scalar ratio with Planck 2018 results, demonstrating consistency within observational bounds. Additionally, it is verified that the thermal domination condition T_*/H > 1 and the torsion dominance condition ρ_T/ρ_rad > 1 are satisfied.

View Accepted Manuscript (DOE)

Research Organization:: University of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-97ER41020

OSTI ID:: 3015520

Journal Information:: European Physical Journal. C, Particles and Fields (Online), Journal Name: European Physical Journal. C, Particles and Fields (Online) Journal Issue: 7 Vol. 85; ISSN 1434-6052

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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