(P)reheating and gravitational waves in $\alpha$-attractor models

Abstract

We study post-inflationary evolution in $\alpha$-attractor T-models of inflation. We consider the dynamics of both scalar fields present in these models: the inflaton and the spectator, as a negative field-space curvature may lead to geometrical destabilization of the spectator. We perform state-of-the-art lattice simulations with a dedicated numerical code optimized for those models. We corroborate earlier findings that the perturbations of the spectator field are much more unstable than the perturbations of the inflaton field, so the dynamics of early stages of preheating is dominated by the evolution of spectator perturbations. We also calculate the spectrum of gravitational waves originating from scalar fluctuations in order to determine if the $\alpha$-attractor T-models can be constrained or even ruled out by present cosmological observations, but not by direct searches of gravitational waves.

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Cited by in corpus (8)

• Oscillon formation during inflationary preheating with general relativity
• Anatomy of geometrical destabilization of inflation
• Gravitational waves from a curvature-induced phase transition of a Higgs-portal dark matter sector
• Gravitational Wave Probe of Gravitational Dark Matter from Preheating
• Potential Surge Preheating: enhanced resonance from potential features
• Nonlinear dynamics of oscillons and transients during preheating after single field inflation
• Curvature perturbations from kinetic preheating after $\alpha$-attractor inflation
• Bayesian analysis for a class of $\alpha$-attractor inflationary models