Reheating predictions in single field inflation

Abstract

Reheating is a transition era after the end of inflation, during which the inflaton is converted into the particles that populate the Universe at later times. No direct cosmological observables are normally traceable to this period of reheating. Indirect bounds can however be derived. One possibility is to consider cosmological evolution for observable CMB scales from the time of Hubble crossing to the present time. Depending upon the model, the duration and final temperature after reheating, as well as its equation of state, may be directly linked to inflationary observables. For single-field inflationary models, if we approximate reheating by a constant equation of state, one can derive relations between the reheating duration (or final temperature), its equation of state parameter, and the scalar power spectrum amplitude and spectral index. While this is a simple approximation, by restricting the equation of state to lie within a broad physically allowed range, one can in turn bracket an allowed range of $n_s$ and $r$ for these models. The added constraints can help break degeneracies between inflation models that otherwise overlap in their predictions for $n_s$ and $r$.

32 pages, 15 figures. Revised in response to comments on the original version, and in preparation for submission for publication. More references and a new figure were added

References in corpus (17)

• The Standard Model Higgs boson as the inflaton
• A Joint Analysis of BICEP2/Keck Array and Planck Data
• Primordial Nucleosynthesis in the Precision Cosmology Era
• Reheating in Inflationary Cosmology: Theory and Applications
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Reheating constraints to inflationary models
• Inflation after WMAP3: Confronting the Slow-Roll and Exact Power Spectra with CMB Data
• Inflation and the Scale Dependent Spectral Index: Prospects and Strategies
• Non-Gaussian Spikes from Chaotic Billiards in Inflation Preheating
• Magnetic field production during preheating at the electroweak scale
• Lattice calculation of non-Gaussianity from preheating
• Reheating temperature from the CMB
• Brane inflation and the WMAP data: a Bayesian analysis
• Primordial magnetic fields from preheating at the electroweak scale
• Observational implications of mattergenesis during inflation
• Non-Perturbative Instabilities as a Solution of the Cosmological Moduli Problem
• On finite density effects on cosmic reheating and moduli decay and implications for Dark Matter production