Curvature perturbations from preheating with scale dependence
File(s)
Published version
Author(s)
Ghoderao, Pulkit S
Rajantie, Arttu
Type
Journal Article
Abstract
We extend the formalism to calculate non-Gaussianity of primordial curvature perturbations produced by preheating in the presence of a light scalar field. The calculation is carried out in the separate universe approximation using the non-perturbative delta N formalism and lattice field theory simulations. Initial conditions for simulations are drawn from a statistical ensemble determined by modes that left the horizon during inflation, with the time-dependence of Hubble rate during inflation taken into account. Our results show that cosmic variance, i.e., the contribution from modes with wavelength longer than the size of the observable universe today, plays a key role in determining the dominant contribution. We illustrate our formalism by applying it to an observationally-viable preheating model motivated by non-minimal coupling to gravity, and study its full parameter dependence.
Date Issued
2024-05-01
Date Acceptance
2024-04-28
Citation
Journal of Cosmology and Astroparticle Physics, 2024, 2024 (5)
ISSN
1475-7516
Publisher
IOP Publishing
Journal / Book Title
Journal of Cosmology and Astroparticle Physics
Volume
2024
Issue
5
Copyright Statement
©2024TheAuthor(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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Subjects
Astronomy & Astrophysics
inflation
non-gaussianity
Physical Sciences
Physics
physics of the early universe
Physics, Particles & Fields
Quantum fields in curved spacetimes
Science & Technology
Publication Status
Published
Article Number
106
Date Publish Online
2024-05-28