Non-Gaussianity from instant and tachyonic preheating

2005/01/31 by Kari Enqvist, Asko Jokinen, Anupam Mazumdar +4 · 20 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Solar and Space Plasma Dynamics #astro-ph #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1088/1475-7516/2005/03/010

published as JCAP 0503 (2005) 010 · 12 pages, 1 figure, additional discussion, improved constraint on the scale of tachyonic preheating

arxiv created 2005/03/18 · openalex publication_date 2005/04/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

We study non-Gaussianity in two distinct models of preheating: instant and tachyonic. In instant preheating non-Gaussianity is sourced by the local terms generated through the coupled perturbations of the two scalar fields. We find that the non-Gaussianity parameter is given by , where g is a coupling constant, so that instant preheating is unlikely to be constrained by WMAP or Planck. In the case of tachyonic preheating non-Gaussianity arises solely from the instability of the tachyon matter and is found to be large. We find that for single-field inflation the present WMAP data imply a bound on the scale of tachyonic instability. We argue that the tachyonic preheating limits are useful also for string-motivated inflationary models.

Citations

• Non-Gaussianity from Inflation: Theory and Observations

Cited by

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• Non-Gaussianity from tachyonic preheating in hybrid inflation
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• Predictions for non-Gaussianity from non-local inflation
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• Running spectral index from shooting-star moduli
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• Evolution of the curvature perturbations during warm inflation
• Non-Gaussian and nonscale-invariant perturbations from tachyonic preheating in hybrid inflation
• Higgs inflation with loop corrections in the Palatini formulation
• On chromonatural inflation in string theory
• Supersymmetric thermalization and quasi-thermal Universe: consequences for gravitinos and leptogenesis
• On the generation of a non-gaussian curvature perturbation during preheating
• Non-Gaussianity in KKLMMT model
• On classification of models of large local-type non-Gaussianity
• The Effect of Nonlinear Gravity on the Cosmological Background During Preheating

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• Tachyonic Preheating
• Cosmological Predictions from the Primordial Universe: Non-Gaussianities
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