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

Journal Article · Sun Aug 15 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.043531· OSTI ID:21420936

Tseliakhovich, Dmitriy; Hirata, Christopher ^[1]; Slosar, Anze ^[2]

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1. Caltech M/C 350-17, Pasadena, California 91125 (United States)
2. Brookhaven National Laboratory, Upton, New York 11973 (United States)

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.

• OSTI ID: 21420936
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
AMPLITUDES
COSMOLOGICAL MODELS
DENSITY
DETECTION
DISTURBANCES
ELECTROMAGNETIC RADIATION
GALAXIES
GAUSSIAN PROCESSES
INFLATIONARY UNIVERSE
MATHEMATICAL MODELS
MICROWAVE RADIATION
PERTURBATION THEORY
PHYSICAL PROPERTIES
RADIATIONS
RELICT RADIATION