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Title: Non-Gaussianity and large-scale structure in a two-field inflationary model

Abstract

Single-field inflationary models predict nearly Gaussian initial conditions, and hence a detection of non-Gaussianity would be a signature of the more complex inflationary scenarios. In this paper we study the effect on the cosmic microwave background and on large-scale structure from primordial non-Gaussianity in a two-field inflationary model in which both the inflaton and curvaton contribute to the density perturbations. We show that in addition to the previously described enhancement of the galaxy bias on large scales, this setup results in large-scale stochasticity. We provide joint constraints on the local non-Gaussianity parameter f-tilde{sub NL} and the ratio {xi} of the amplitude of primordial perturbations due to the inflaton and curvaton using WMAP and Sloan Digital Sky Survey data.

Authors:
;  [1];  [2]
  1. Caltech M/C 350-17, Pasadena, California 91125 (United States)
  2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
Publication Date:
OSTI Identifier:
21420936
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 82; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevD.82.043531; (c) 2010 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; DENSITY; DETECTION; DISTURBANCES; GALAXIES; GAUSSIAN PROCESSES; INFLATIONARY UNIVERSE; PERTURBATION THEORY; RELICT RADIATION; COSMOLOGICAL MODELS; ELECTROMAGNETIC RADIATION; MATHEMATICAL MODELS; MICROWAVE RADIATION; PHYSICAL PROPERTIES; RADIATIONS

Citation Formats

Tseliakhovich, Dmitriy, Hirata, Christopher, and Slosar, Anze. Non-Gaussianity and large-scale structure in a two-field inflationary model. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.82.043531.
Tseliakhovich, Dmitriy, Hirata, Christopher, & Slosar, Anze. Non-Gaussianity and large-scale structure in a two-field inflationary model. United States. doi:10.1103/PHYSREVD.82.043531.
Tseliakhovich, Dmitriy, Hirata, Christopher, and Slosar, Anze. Sun . "Non-Gaussianity and large-scale structure in a two-field inflationary model". United States. doi:10.1103/PHYSREVD.82.043531.
@article{osti_21420936,
title = {Non-Gaussianity and large-scale structure in a two-field inflationary model},
author = {Tseliakhovich, Dmitriy and Hirata, Christopher and Slosar, Anze},
abstractNote = {Single-field inflationary models predict nearly Gaussian initial conditions, and hence a detection of non-Gaussianity would be a signature of the more complex inflationary scenarios. In this paper we study the effect on the cosmic microwave background and on large-scale structure from primordial non-Gaussianity in a two-field inflationary model in which both the inflaton and curvaton contribute to the density perturbations. We show that in addition to the previously described enhancement of the galaxy bias on large scales, this setup results in large-scale stochasticity. We provide joint constraints on the local non-Gaussianity parameter f-tilde{sub NL} and the ratio {xi} of the amplitude of primordial perturbations due to the inflaton and curvaton using WMAP and Sloan Digital Sky Survey data.},
doi = {10.1103/PHYSREVD.82.043531},
journal = {Physical Review. D, Particles Fields},
number = 4,
volume = 82,
place = {United States},
year = {Sun Aug 15 00:00:00 EDT 2010},
month = {Sun Aug 15 00:00:00 EDT 2010}
}