Current Constraints on Cosmological Scenarios with Very Low Reheating Temperatures
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 Letter 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.
Authors
- M. Lattanzi (ORCID: https://orcid.org/0000-0003-1059-2532)
- Thejs Brinckmann (ORCID: https://orcid.org/0000-0002-1492-5181)
- S. Pastor (ORCID: https://orcid.org/0000-0003-0933-7710)
- Stefano Gariazzo (ORCID: https://orcid.org/0000-0002-4160-6987)
- O. Pisanti (ORCID: https://orcid.org/0000-0002-2745-9204)
- Nicola Barbieri
Institutions
- Universitat de València (ES)
- University of Ferrara (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT)
- Instituto de Física Corpuscular (ES)
- Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT)
- University of Turin (IT)
- University of Naples Federico II (IT)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-10-07
- DOI
- https://doi.org/10.1103/j5rj-dz1k
- Citations
- 8
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 9.24
Funders
- Ministerio de Ciencia, Innovación y Universidades
- Istituto Nazionale di Fisica Nucleare
- Ministero dell'Università e della Ricerca
- Agencia Estatal de Investigación