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Título: | Characterizing the postinflationary reheating history: Single daughter field with quadratic-quadratic interaction |
Autor: | Antusch, Stefan; Figueroa, Daniel G.; Marschall, K.; Torrentí Salom, Francisco | Fecha de publicación: | feb-2022 | Editor: | American Physical Society | Citación: | Physical Review D 105: 043532 (2022) | Resumen: | We study the evolution of the energy distribution and equation of state of the Universe from the end of inflation until the onset of either radiation domination (RD) or a transient period of matter domination (MD). We use both analytical techniques and lattice simulations. We consider two-field models where the inflaton φ has a monomial potential after inflation V(φ) |φ-v|p (p≥2) and is coupled to a daughter field X through a quadratic-quadratic interaction g2φ2X2. We consider two situations, depending on whether the potential has a minimum at (i) v=0, or (ii) v>0. In the scenario (i), the final energy transferred to X is independent of g2 and entirely determined by p: it is negligible for p<4, and of order ∼50% for p≥4. The system goes to MD at late times for p=2, while it goes to RD for p>2. In the later case, we can calculate exactly the number of e-folds until RD as a function of g2, and hence predict accurately inflationary observables like the scalar tilt ns and the tensor-to-scalar ratio r. In the scenario (ii), the energy is always transferred completely to X for p>2, as long as its effective mass mX2=g2(φ-v)2 is not negligible. For p=2, the final ratio between the energy densities of X and φ depends strongly on g2. For all p≥2, the system always goes to MD at late times. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevD.105.043532 | URI: | http://hdl.handle.net/10261/296961 | DOI: | 10.1103/PhysRevD.105.043532 | Identificadores: | doi: 10.1103/PhysRevD.105.043532 issn: 2470-0029 |
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8_Antusch.pdf | 10,37 MB | Adobe PDF | Visualizar/Abrir |
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