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:
-
- Caltech M/C 350-17, Pasadena, California 91125 (United States)
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Publication Date:
- OSTI Identifier:
- 21420936
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review. D, Particles Fields
- Additional Journal Information:
- Journal Volume: 82; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevD.82.043531; (c) 2010 American Institute of Physics; Journal ID: ISSN 0556-2821
- 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. https://doi.org/10.1103/PHYSREVD.82.043531
Tseliakhovich, Dmitriy, Hirata, Christopher, and Slosar, Anze. 2010.
"Non-Gaussianity and large-scale structure in a two-field inflationary model". United States. https://doi.org/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},
url = {https://www.osti.gov/biblio/21420936},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
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}
}