Multi-field formulation of gravitational particle production after inflation

Abstract

We study multi-field inflation models that contain a non-trivial field-space metric and a non-minimal coupling between the gravity and inflaton sectors. In such models it is known that even in the absence of explicit interaction terms the inflaton sector can decay into matter as a result of its non-minimal coupling to gravity, thereby reheating the Universe gravitationally. Using the Bogoliubov approach we evaluate the gravitational decay rates of the inflaton fields into both scalars and fermions, and analyse the reheating dynamics. We also discuss how the interpretation of the reheating dynamics differs in the so-called Jordan and Einstein frames, highlighting that the calculation of the Bogoliubov coefficients is independent of the frame in which one starts.

23 pages. v2: Minor changes and references added to match published version

References in corpus (18)

• The Standard Model Higgs boson as the inflaton
• A Joint Analysis of BICEP2/Keck Array and Planck Data
• Reheating in Inflationary Cosmology: Theory and Applications
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Constraining f(R) Gravity as a Scalar Tensor Theory
• Reheating constraints to inflationary models
• Non-Gaussianity in the modulated reheating scenario
• Conformal Transformations with Multiple Scalar Fields
• Primordial Bispectrum from Multifield Inflation with Nonminimal Couplings
• Gravitational Effects on Inflaton Decay
• Scalaron the mighty: producing dark matter and baryon asymmetry at reheating
• Multifield Dynamics of Higgs Inflation
• Probing reheating with primordial spectrum
• Reheating of the universe after inflation with f(phi)R gravity
• Reheating, Multifield Inflation and the Fate of the Primordial Observables
• General analytic predictions of two-field inflation and perturbative reheating
• Rate of gravitational inflaton decay via gauge trace anomaly
• Gravitational inflaton decay and the hierarchy problem

Cited by in corpus (17)

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• Inflation and reheating in theories with spontaneous scale invariance symmetry breaking
• Dark matter from gravitational particle production at reheating
• Superheavy scalar dark matter from gravitational particle production in $\alpha$-attractor models of inflation
• From Wires to Cosmology
• Invariant quantities in the multiscalar-tensor theories of gravitation
• Post-Newtonian parameter $\gamma$ for multiscalar-tensor gravity with a general potential
• Particle Production after Inflation with Non-minimal Derivative Coupling to Gravity
• Reheating and Dark Matter Freeze-in in the Higgs-$R^2$ Inflation Model
• Quantum interference in gravitational particle production
• Multifield Stochastic Particle Production: Beyond a Maximum Entropy Ansatz
• Multifield Reheating after Modular $j$-Inflation
• Black holes from multiplets of scalar fields in 2+1- and 3+1-dimensions
• Non-perturbative approach for scalar particle production in Higgs-$R^2$ inflation