Self-resonance after inflation: oscillons, transients and radiation domination

Abstract

Homogeneous oscillations of the inflaton after inflation can be unstable to small spatial perturbations even without coupling to other fields. We show that for inflaton potentials $\propto |\varphi {|}^{2n}$ near $|\varphi |=0$ and flatter beyond some $|\varphi |=M$, the inflaton condensate oscillations can lead to self-resonance, followed by its complete fragmentation. We find that for non-quadratic minima ($n>1$), shortly after backreaction, the equation of state parameter, $w\to 1/3$. If $M\ll m_{pl}$, radiation domination is established within less than an e-fold of expansion after the end of inflation. In this case self-resonance is efficient and the condensate fragments into transient, localised spherical objects which are unstable and decay, leaving behind them a virialized field with mean kinetic and gradient energies much greater than the potential energy. This end-state yields $w=1/3$. When $M\ll m_{pl}$ we observe slow and steady, self-resonace that can last many {\it e}-folds before backreaction eventually shuts it off, followed by fragmentation and $w\to 1/3$. We provide analytical estimates for the duration to $w\to 1/3$ after inflation, which can be used as an upper bound (under certain assumptions) on the duration of the transition between the inflationary and the radiation dominated states of expansion. This upper bound can reduce uncertainties in CMB observables such as the spectral tilt $n_{\mathrm{s}}$, and the tensor-to-scalar ratio $r$. For quadratic minima ($n=1$), $w\to 0$ regardless of the value of $M$.

25 pages, 16 figures

References in corpus (20)

• Monodromy in the CMB: Gravity Waves and String Inflation
• Reheating in Inflationary Cosmology: Theory and Applications
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• The Unity of Cosmological Attractors
• Theory and Numerics of Gravitational Waves from Preheating after Inflation
• Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any Supersymmetric Model
• Reheating constraints to inflationary models
• Reheating predictions in single field inflation
• The Powers of Monodromy
• Quantum Radiation of Oscillons
• Single-field $\alpha$-attractors
• Flat-top oscillons in an expanding universe
• Inflaton Fragmentation and Oscillon Formation in Three Dimensions
• Dynamical and Gravitational Instability of Oscillating-Field Dark Energy and Dark Matter
• DEFROST: A New Code for Simulating Preheating after Inflation
• Reheating temperature from the CMB
• ${\varphi }^2$ or Not ${\varphi }^2$: Testing the Simplest Inflationary Potential
• ${\varphi }^2$ Inflation at its Endpoint
• Was the Universe Actually Radiation Dominated Prior to Nucleosynthesis?
• Multifield Stochastic Particle Production: Beyond a Maximum Entropy Ansatz

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