Non-Gaussianity from massless preheating

2008/05/31 by Alex Chambers, Arttu Rajantie · 2 citations
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Cosmology and Gravitation Theories #Quantum Electrodynamics and Casimir Effect #astro-ph #hep-ph

paper · pdf · doi:10.1088/1475-7516/2008/08/002

published as JCAP 08 (2008) 002 · 26 pages, 9 figures, 1 table; erratum added

openalex publication_date 2008/08/04 · arxiv created 2008/09/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

Preheating can convert superhorizon fluctuations of light scalar fields present at the end of inflation into observable density perturbations. We show in detail how lattice field theory simulations and the separate universes approximation can be used to calculate these perturbations and make predictions for the nonlinearity parameter f NL . We also present a simple approximation scheme that can reproduce these results analytically. Applying these methods to the massless preheating model, we determine the parameter values that are ruled out by too high levels of non-Gaussianity.

Citations

• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Non-Gaussianity from Inflation: Theory and Observations
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• FIVE-YEARWILKINSON MICROWAVE ANISOTROPY PROBEOBSERVATIONS: COSMOLOGICAL INTERPRETATION
• Non-Gaussianity from tachyonic preheating in hybrid inflation

Cited by

• Non-Gaussianity from resonant curvaton decay
• Supersymmetric hybrid inflation with a light scalar