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, Kenneth, Torrenti, Francisco |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys.Lett.B 811 (2020) 135888 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2020.135888 |
| Popis: | 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 $V(\phi) \propto |\phi|^p$ around the origin. As a proxy for (p)reheating, we include a quadratic interaction $g^2\phi^2X^2$ between the inflaton $\phi$ and a light scalar 'daughter' field $X$, with $g^2>0$. 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 $g^2$, ; $ii)$ the final transfer of energy is always negligible for $2 \leq p < 4$, and of order $\sim 50\%$ for $p \geq 4$; $iii)$ 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 $n_s$ and $r$. Comment: 7 pages + references, 5 figures. It matches published version |
| Databáze: | arXiv |
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