Current constraints on cosmological scenarios with very low reheating temperatures

2025/01/02 by Nicola Barbieri, Barbieri, Nicola, Thejs Brinckmann +9 · 16 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Current (fluid) #Economics #Environmental science #FOS: Physical sciences #Physics #Thermodynamics

paper · pdf · doi:10.48550/arxiv.2501.01369

published in arXiv (Cornell University) (Cornell University)

openalex publication_date 2025/01/02 · openalex created_date 2025/01/04 · openalex updated_date 2026/08/01

Abstract

We present a comprehensive analysis of the effects of models with very low reheating scenarios (T_RH ∼ O(MeV)) on the cosmological observables and derive corresponding bounds on the reheating temperature. With respect to previous work, our study includes a more precise computation of neutrino distribution functions, leveraging the latest datasets from cosmological surveys. We perform a joint analysis that combines constraints from Big Bang Nucleosynthesis, the Cosmic Microwave Background, and galaxy surveys, alongside separate investigations of these datasets, carefully assessing the impact of different choices of priors. At the 95% confidence level, we establish a lower bound on the reheating temperature of T_RH > 5.96 MeV , representing the most stringent constraint to date.

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