Tachyonic preheating in plateau inflation

Tomberg, Eemeli and Veermae, Hardi (2021) Tachyonic preheating in plateau inflation. Journal of Cosmology and Astroparticle Physics, 2021 (12): 035. ISSN 1475-7516

Full text not available from this repository.

Abstract

Plateau inflation is an experimentally consistent framework in which the scale of inflation can be kept relatively low. Close to the edge of the plateau, scalar perturbations are subject to a strong tachyonic instability. Tachyonic preheating is realized when, after inflation, the oscillating inflaton repeatedly re-enters the plateau. We develop the analytic theory of this process and expand the linear approach by including backreaction between the coherent background and growing perturbations. For a family of plateau models, the analytic predictions are confronted with numerical estimates. Our analysis shows that the inflaton fragments in a fraction of an e-fold in all examples supporting tachyonic preheating, generalizing the results of previous similar studies. In these scenarios, the scalar-to-tensor ratio is tiny, r < 10-7.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
?? cosmological perturbation theoryinflationquantum field theory on curved spaceastronomy and astrophysics ??
ID Code:
211963
Deposited By:
Deposited On:
31 Dec 2023 01:24
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jul 2024 00:41