Hidden regimes during preheating

0522493 - FZÚ 2020 RIV US eng J - Journal Article
Sengör, Gizem
Hidden regimes during preheating.
Physical Review D. Roč. 100, č. 4 (2019), s. 1-16, č. článku 043503. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA MŠMT EF16_027/0008215
Grant - others:MOBILITY FZU(XE) CZ.02.2.69/0.0/0.0/16_027/0008215
Institutional support: RVO:68378271
Keywords : scalars * models * scalar spectral
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 4.833, year: 2019
Method of publishing: Limited access
https://doi.org/10.1103/physrevd.100.043503

The effective field theory (EFT) of preheating with scalar fields implies three types of derivative couplings between the inflaton and the reheating field. Two of these couplings lead to scales below which only one of the two species appear as the low energy modes. In this paper, the variety of low energy regimes in terms of the species they accommodate are explored by studying the scales introduced by the derivative couplings and the dispersion relations they lead to. It is noted that the EFT of two scalar fields can give rise to nontrivial sound speed for both the inflation and reheating sector, even at scales where the modes of both species propagate freely, suggesting the presence of additional heavy fields. The regimes where one of the species affects the dispersion relation of the other while not appearing as an effective mode itself are named as “hidden regimes” during preheating.

Permanent Link: http://hdl.handle.net/11104/0306973