On preheating in alpha-attractor models of inflation

Abstract

We study (p)reheating in alpha-attractor T-models of inflation, taking into account both scalar fields present in these models: the inflaton and the spectator. The two-field model has a negative field-space curvature which, at the end of inflation, may lead to geometrical destabilization of the spectator for small values of alpha<~10^(-3). We perform the instability (Floquet) analysis of the linear dynamics and a fully non-linear lattice computations with our numerical code, which we specifically designed for a class of two-field models with non-canonical kinetic terms. We find that the perturbations of the spectator field are much more unstable than the perturbations of the inflaton field, so the dynamics of the early stages of preheating is dominated by the evolution of the spectator perturbations. As a result, the transition from the inflationary era to radiation domination era is practically instantaneous and much faster than previously found in an effective theory including only the inflaton field.

arXiv commentextended numerical simulations, references added, matches published version

References in corpus (32)

• f(R) theories
• Towards the Theory of Reheating After Inflation
• Reheating after Inflation
• Encyclopaedia Inflationaris
• Inflation Dynamics and Reheating
• Universe Reheating after Inflation
• Superconformal Inflationary $\alpha$-Attractors
• How long before the end of inflation were observable perturbations produced?
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Reheating constraints to inflationary models
• Oscillons After Inflation
• Reheating predictions in single field inflation
• Self-resonance after inflation: oscillons, transients and radiation domination
• LATTICEEASY: A Program for Lattice Simulations of Scalar Fields in an Expanding Universe
• Perturbations in generalized multi-field inflation
• Curvature and isocurvature perturbations in two-field inflation
• Observing the Inflationary Reheating
• The Equation of State and Duration to Radiation Domination After Inflation
• Cosmological Attractors and Initial Conditions for Inflation
• Inflation and the Scale Dependent Spectral Index: Prospects and Strategies
• The Hyperbolic Geometry of Cosmological Attractors
• Geometrical Destabilization of Inflation
• Constraints on α-attractor inflation and reheating
• DEFROST: A New Code for Simulating Preheating after Inflation
• Primordial fluctuations and non-Gaussianities in sidetracked inflation
• Universality of multi-field $\alpha$-attractors
• CMB and reheating constraints to α-attractor inflationary models
• Hypernatural inflation
• ${\varphi }^2$ or Not ${\varphi }^2$: Testing the Simplest Inflationary Potential
• Universality and scaling in multi-field $\alpha$-attractor preheating
• Geometrical destabilization, premature end of inflation and Bayesian model selection
• PyCOOL - a Cosmological Object-Oriented Lattice code written in Python

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• The Linear Regime of Tachyonic Preheating
• Variable Inflaton Equation of State and Reheating
• (P)reheating and gravitational waves in $\alpha$-attractor models
• Large Density Perturbations from Reheating to Standard Model particles due to the Dynamics of the Higgs Boson during Inflation
• Dark Matter from Entropy Perturbations in Curved Field Space
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• Characterizing the post-inflationary reheating history, Part II: Multiple interacting daughter fields
• Is asymptotically safe inflation eternal?
• Present and future of CosmoLattice
• Anatomy of geometrical destabilization of inflation
• Dissipative Emergence of Inflation from Quasi-Cyclic Universe
• Low-energy probes of small CMB amplitude in models of radiative Higgs mechanism
• Equation of state during (p)reheating with trilinear interactions
• Potential Surge Preheating: enhanced resonance from potential features
• Curvature perturbations from kinetic preheating after $\alpha$-attractor inflation
• Nonlinear dynamics of oscillons and transients during preheating after single field inflation
• Self-resonance during preheating: The case of $\alpha$-attractor models
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