Non-Gaussianity from Instant and Tachyonic Preheating

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dc.creatorEnqvist, Kari
dc.creatorJokinen, Asko
dc.creatorMazumdar, Anupam
dc.creatorMultamaki, Tuomas
dc.creatorVaihkonen, Antti
dc.date2005-01-10
dc.date2005-03-18
dc.date.accessioned2026-07-07T03:54:14Z
dc.date.available2026-07-07T03:54:14Z
dc.descriptionWe 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 $f_{NL}^ϕ\sim 2g < O(1)$, 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 implies a bound $V_{0}^{1/4}/M_{P}\leq 10^{-4}$ on the scale of tachyonic instability. We argue that the tachyonic preheating limits are useful also for string-motivated inflationary models.
dc.description12 pages, 1 figure, additional discussion, improved constraint on the scale of tachyonic preheating
dc.identifierhttps://arxiv.org/abs/hep-ph/0501076
dc.identifierhttp://arxiv.org/abs/hep-ph/0501076
dc.identifierJCAP 0503 (2005) 010
dc.identifierdoi:10.1088/1475-7516/2005/03/010
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/44156
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleNon-Gaussianity from Instant and Tachyonic Preheating
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