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

Tseliakhovich, Dmitriy and Hirata, Christopher and Slosar, Anže (2010) Non-Gaussianity and large-scale structure in a two-field inflationary model. Physical Review D, 82 (4). Art. No. 043531. ISSN 1550-7998.

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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(over-tilde)_(NL) and the ratio ξ of the amplitude of primordial perturbations due to the inflaton and curvaton using WMAP and Sloan Digital Sky Survey data.

Item Type:Article
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URLURL TypeDescription
Hirata, Christopher0000-0002-2951-4932
Additional Information:© 2010 American Physical Society. Received 26 April 2010; published 30 August 2010. The authors are grateful to Shirley Ho for providing the large-scale structure samples used in this study. D. T. and C. H. are supported by the U.S. Department of Energy (DEFG03-92-ER40701) and the National Science Foundation (AST-0807337). C. H. is supported by the Alfred P. Sloan Foundation. This work was supported in part by the U.S. Department of Energy under Contract No. DE-AC02- 98CH10886.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-92-ER40701
Alfred P. Sloan FoundationUNSPECIFIED
Department of Energy (DOE)DE-AC02-98CH10886
Issue or Number:4
Classification Code:PACS: 98.80.Cq
Record Number:CaltechAUTHORS:20100921-090348465
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20062
Deposited By: Jason Perez
Deposited On:21 Sep 2010 17:59
Last Modified:03 Oct 2019 02:05

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