A new twist to preheating

Abstract

Metric perturbations typically strengthen field resonances during preheating. In contrast we present a model in which the super-Hubble field resonances are completely {\em suppressed} when metric perturbations are included. The model is the nonminimal Fakir-Unruh scenario which is exactly solvable in the long-wavelength limit when metric perturbations are included, but exhibits exponential growth of super-Hubble modes in their absence. This gravitationally enhanced integrability is exceptional, both for its rarity and for the power with which it illustrates the importance of including metric perturbations in consistent studies of preheating. We conjecture a no-go result - there exists no {\em single-field} model with growth of cosmologically-relevant metric perturbations during preheating.

6 pages, 3 figures, Version to appear in Physical Review D

References in corpus (4)

• Restoring the sting to metric preheating
• Preheating with non-minimally coupled scalar fields in higher-curvature inflation models
• On generation of metric perturbations during preheating
• Preheating of the nonminimally coupled inflaton field

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• Preheating after Multifield Inflation with Nonminimal Couplings, I: Covariant Formalism and Attractor Behavior
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• Preheating after multifield inflation with nonminimal couplings, III: Dynamical spacetime results
• Inflationary preheating and primordial black holes
• Preheating after multifield inflation with nonminimal couplings, II: Resonance Structure
• Backreaction and the Parametric Resonance of Cosmological Fluctuations
• Angular inflation in multi-field $\alpha$-attractors
• New constraints on multi-field inflation with nonminimal coupling
• Primordial Perturbations from Multifield Inflation with Nonminimal Couplings
• Universality and scaling in multi-field $\alpha$-attractor preheating
• Perturbations in Matter Bounce with Non-minimal Coupling
• Reconstruction of a Nonminimal Coupling Theory with Scale-invariant Power Spectrum
• Neutron Star Structure in the Presence of Nonminimally Coupled Scalar Fields
• Opening the reheating box in multifield inflation