Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings
Author(s)Kaiser, David I.
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical review letters
American Physical Society (APS)
Nguyen, Rachel et al. "Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings." Physical review letters 123 (2019): 171301 © 2019 The Author(s)
Final published version
General Physics and Astronomy