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Very Large Primordial Non-Gaussianity from multi-field: Application to Massless Preheating

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Very Large Primordial Non-Gaussianity from multi-field: Application to Massless Preheating. / Jokinen, Asko; Mazumdar, Anupam.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2006, No. 4, 3, 06.04.2006.

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Jokinen A, Mazumdar A. Very Large Primordial Non-Gaussianity from multi-field: Application to Massless Preheating. Journal of Cosmology and Astroparticle Physics. 2006 Apr 6;2006(4):3. doi: 10.1088/1475-7516/2006/04/003

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Jokinen, Asko ; Mazumdar, Anupam. / Very Large Primordial Non-Gaussianity from multi-field : Application to Massless Preheating. In: Journal of Cosmology and Astroparticle Physics. 2006 ; Vol. 2006, No. 4.

Bibtex

@article{6d740c0178774f15b9ac12888d3583a2,
title = "Very Large Primordial Non-Gaussianity from multi-field: Application to Massless Preheating",
abstract = "In this paper we derive a generic expression, which is valid for scales larger than Hubble radius and contains only the local terms, for the second order curvature perturbations for more than one field, provided the expansion is sourced by the energy density of a single field. As an application, motivated by our previous paper [1], we apply our formalism to two fields during preheating, where the inflaton oscillations are sourced by $\lambda\phi^4$ potential which is governing the expansion of the Universe. A second field $\sigma$, coupled to the inflaton through $g^2\phi^2\sigma^2$, is excited from the vacuum fluctuations. The excited modes of $\sigma$ amplify the super-Hubble isocurvature perturbations, which seed the second order curvature perturbations to give rise to a significantly large non-Gaussianity. Our results show that within 3 inflaton oscillations for a range of parameters, $1",
keywords = "cosmological perturbation theory, inflation, physics of the early universe",
author = "Asko Jokinen and Anupam Mazumdar",
note = "23 pages, JHEP style, references added",
year = "2006",
month = apr,
day = "6",
doi = "10.1088/1475-7516/2006/04/003",
language = "English",
volume = "2006",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "4",

}

RIS

TY - JOUR

T1 - Very Large Primordial Non-Gaussianity from multi-field

T2 - Application to Massless Preheating

AU - Jokinen, Asko

AU - Mazumdar, Anupam

N1 - 23 pages, JHEP style, references added

PY - 2006/4/6

Y1 - 2006/4/6

N2 - In this paper we derive a generic expression, which is valid for scales larger than Hubble radius and contains only the local terms, for the second order curvature perturbations for more than one field, provided the expansion is sourced by the energy density of a single field. As an application, motivated by our previous paper [1], we apply our formalism to two fields during preheating, where the inflaton oscillations are sourced by $\lambda\phi^4$ potential which is governing the expansion of the Universe. A second field $\sigma$, coupled to the inflaton through $g^2\phi^2\sigma^2$, is excited from the vacuum fluctuations. The excited modes of $\sigma$ amplify the super-Hubble isocurvature perturbations, which seed the second order curvature perturbations to give rise to a significantly large non-Gaussianity. Our results show that within 3 inflaton oscillations for a range of parameters, $1

AB - In this paper we derive a generic expression, which is valid for scales larger than Hubble radius and contains only the local terms, for the second order curvature perturbations for more than one field, provided the expansion is sourced by the energy density of a single field. As an application, motivated by our previous paper [1], we apply our formalism to two fields during preheating, where the inflaton oscillations are sourced by $\lambda\phi^4$ potential which is governing the expansion of the Universe. A second field $\sigma$, coupled to the inflaton through $g^2\phi^2\sigma^2$, is excited from the vacuum fluctuations. The excited modes of $\sigma$ amplify the super-Hubble isocurvature perturbations, which seed the second order curvature perturbations to give rise to a significantly large non-Gaussianity. Our results show that within 3 inflaton oscillations for a range of parameters, $1

KW - cosmological perturbation theory

KW - inflation

KW - physics of the early universe

U2 - 10.1088/1475-7516/2006/04/003

DO - 10.1088/1475-7516/2006/04/003

M3 - Journal article

VL - 2006

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 4

M1 - 3

ER -