Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings
Name
PhysRevLett.123.171301.pdf
Description
Published version
Size
989.62 KB
Format
Adobe PDF
Checksum (MD5)
372d241c8bfff7a7e5908a306705377c
Author(s)
Kaiser, David I.
Date Issued
October 25, 2019
Journal
Physical review letters
Publisher
American Physical Society (APS)
Citation
Nguyen, Rachel et al. "Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings." Physical review letters 123 (2019): 171301 © 2019 The Author(s)
Version
Final published version
Abstract
We study the postinflation dynamics of multifield models involving nonminimal couplings using lattice simulations to capture significant nonlinear effects like backreaction and rescattering. We measure the effective equation of state and typical timescales for the onset of thermalization, which could affect the usual mapping between predictions for primordial perturbation spectra and measurements of anisotropies in the cosmic microwave background radiation. For large values of the nonminimal coupling constants, we find efficient particle production that gives rise to nearly instantaneous preheating. Moreover, the strong single-field attractor behavior that was previously identified persists until the end of preheating, thereby suppressing typical signatures of multifield models. We therefore find that predictions for primordial observables in this class of models retain a close match to the latest observations.
Subjects
General Physics and Astronomy
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/physrevlett.123.171301
