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Title: Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results

Abstract

This paper concludes our semianalytic study of preheating in inflationary models comprised of multiple scalar fields coupled nonminimally to gravity. Using the covariant framework of paper I in this series, we extend here the rigid-spacetime results of paper II by considering both the expansion of the Universe during preheating, as well as the effect of the coupled metric perturbations on particle production. The adiabatic and isocurvature perturbations are governed by different effective masses that scale differently with the nonminimal couplings and evolve differently in time. The effective mass for the adiabatic modes is dominated by contributions from the coupled metric perturbations immediately after inflation. The metric perturbations contribute an oscillating tachyonic term that enhances an early period of significant particle production for the adiabatic modes, which ceases on a time scale governed by the nonminimal couplings $${{\xi}}_{I}$$. The effective mass of the isocurvature perturbations, on the other hand, is dominated by contributions from the fields' potential and from the curvature of the field-space manifold (in the Einstein frame), the balance between which shifts on a time scale governed by $${{\xi}}_{I}$$. As in papers I and II, we identify distinct behavior depending on whether the nonminimal couplings are small [$${{\xi}}_{I}{\lesssim}\mathcal{O}(1)$$], intermediate [$${{\xi}}_{I}{\sim}\mathcal{O}(1{-}10)$$], or large ($${{\xi}}_{I}{\ge}100$$).

Authors:
 [1];  [1];  [1];  [2];  [3]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
  2. Univ. of Washington, Seattle, WA (United States). Dept. of Physics
  3. Univ. of Illinois, Urbana, IL (United States). Dept. of Physics
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1505820
Alternate Identifier(s):
OSTI ID: 1418193
Grant/Contract Number:  
SC0012567
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology; inflation; particle astrophysics

Citation Formats

DeCross, Matthew P., Kaiser, David I., Prabhu, Anirudh, Prescod-Weinstein, Chanda, and Sfakianakis, Evangelos I.. Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results. United States: N. p., 2018. Web. https://doi.org/10.1103/physrevd.97.023528.
DeCross, Matthew P., Kaiser, David I., Prabhu, Anirudh, Prescod-Weinstein, Chanda, & Sfakianakis, Evangelos I.. Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results. United States. https://doi.org/10.1103/physrevd.97.023528
DeCross, Matthew P., Kaiser, David I., Prabhu, Anirudh, Prescod-Weinstein, Chanda, and Sfakianakis, Evangelos I.. Fri . "Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results". United States. https://doi.org/10.1103/physrevd.97.023528. https://www.osti.gov/servlets/purl/1505820.
@article{osti_1505820,
title = {Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results},
author = {DeCross, Matthew P. and Kaiser, David I. and Prabhu, Anirudh and Prescod-Weinstein, Chanda and Sfakianakis, Evangelos I.},
abstractNote = {This paper concludes our semianalytic study of preheating in inflationary models comprised of multiple scalar fields coupled nonminimally to gravity. Using the covariant framework of paper I in this series, we extend here the rigid-spacetime results of paper II by considering both the expansion of the Universe during preheating, as well as the effect of the coupled metric perturbations on particle production. The adiabatic and isocurvature perturbations are governed by different effective masses that scale differently with the nonminimal couplings and evolve differently in time. The effective mass for the adiabatic modes is dominated by contributions from the coupled metric perturbations immediately after inflation. The metric perturbations contribute an oscillating tachyonic term that enhances an early period of significant particle production for the adiabatic modes, which ceases on a time scale governed by the nonminimal couplings ${{\xi}}_{I}$. The effective mass of the isocurvature perturbations, on the other hand, is dominated by contributions from the fields' potential and from the curvature of the field-space manifold (in the Einstein frame), the balance between which shifts on a time scale governed by ${{\xi}}_{I}$. As in papers I and II, we identify distinct behavior depending on whether the nonminimal couplings are small [${{\xi}}_{I}{\lesssim}\mathcal{O}(1)$], intermediate [${{\xi}}_{I}{\sim}\mathcal{O}(1{-}10)$], or large (${{\xi}}_{I}{\ge}100$).},
doi = {10.1103/physrevd.97.023528},
journal = {Physical Review D},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

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