Dark energy with the help of interacting dark sectors
| Autor: | Gomes, Joaquim M., Hardy, Edward, Parameswaran, Susha |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys.Rev.D 110 (2024) 2, 023533 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.110.023533 |
| Popis: | We analyse theories that do not have a de Sitter vacuum and cannot lead to slow-roll quintessence, but which nevertheless support a transient era of accelerated cosmological expansion due to interactions between a scalar $\phi$ and either a hidden sector thermal bath, which evolves as Dark Radiation, or an extremely-light component of Dark Matter. We show that simple models can explain the present-day Dark Energy of the Universe consistently with current observations. This is possible both when $\phi$'s potential has a hilltop form and when it has a steep exponential run-away, as might naturally arise from string theory. We also discuss a related theory of multi-field quintessence, in which $\phi$ is coupled to a sector that sources a subdominant component of Dark Energy, which overcomes many of the challenges of slow-roll quintessence. Comment: 35 pages + appendices (two columns), 10 figures; added appendix on cosmological perturbations, 1 figure and footnotes |
| Databáze: | arXiv |
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