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Título: | Energy distribution and equation of state of the early Universe: Matching the end of inflation and the onset of radiation domination |
Autor: | Antusch, Stefan; Figueroa, Daniel G.; Marschall, K.; Torrentí Salom, Francisco | Fecha de publicación: | dic-2020 | Editor: | Elsevier BV | Citación: | PHYSICS LETTERS B 811: 135888 (2020) | Resumen: | We study the energy distribution and equation of state of the universe between the end of inflation and the onset of radiation domination (RD), considering observationally consistent single-field inflationary scenarios, with a potential ‘flattening’ at large field values, and a monomial shape V(ϕ)∝|ϕ| around the origin. As a proxy for (p)reheating, we include a quadratic interaction gϕX between the inflaton ϕ and a light scalar ‘daughter’ field X, with g>0. We capture the non-perturbative and non-linear nature of the system dynamics with lattice simulations, obtaining that: i) the final energy transferred to X depends only on p, not on g; ii) the final transfer of energy is always negligible for 2≤p<4, and of order ∼50% for p≥4; iii) the system goes at late times to matter-domination for p=2, and always to RD for p>2. In the latter case we calculate the number of e-folds until RD, significantly reducing the uncertainty in the inflationary observables n and r. | Versión del editor: | http://dx.doi.org/10.1016/j.physletb.2020.135888 | URI: | http://hdl.handle.net/10261/233409 | DOI: | 10.1016/j.physletb.2020.135888 | Identificadores: | doi: 10.1016/j.physletb.2020.135888 issn: 0370-2693 |
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