Gravitational reheating formulas and bounds in oscillating backgrounds. II. Constraints on the spectral index and gravitational dark matter production
The reheating temperature plays a crucial role in the early Universe’s evolution, marking the transition from inflation to the radiation-dominated era. It directly impacts the number of ¿-folds and, consequently, the observable parameters of inflation, such as the spectral index of scalar perturbati...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/430307 |
| Acceso en línea: | https://hdl.handle.net/2117/430307 https://dx.doi.org/10.1103/PhysRevD.111.043537 |
| Access Level: | acceso abierto |
| Palabra clave: | Cosmology Particle dark matter Àrees temàtiques de la UPC::Física::Astronomia i astrofísica::Cosmologia i cosmogonia |
| Sumario: | The reheating temperature plays a crucial role in the early Universe’s evolution, marking the transition from inflation to the radiation-dominated era. It directly impacts the number of ¿-folds and, consequently, the observable parameters of inflation, such as the spectral index of scalar perturbations. By establishing a relationship between the gravitational reheating temperature and the spectral index, we can derive constraints on inflationary models. Specifically, the range of viable reheating temperatures imposes bounds on the spectral index, which can then be compared with observational data, such as those from the Planck satellite, to test the consistency of various models with cosmological observations. Additionally, in the context of dark matter production, we demonstrate that gravitational reheating provides a viable mechanism when there is a relationship between the mass of the dark matter particles and the mass of the particles responsible for reheating. This connection offers a pathway to link dark matter genesis with inflationary and reheating parameters, allowing for a unified perspective on early Universe dynamics. |
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