Constraints on primordial non-Gaussianity from WMAP7 and luminous red galaxies power spectrum and forecast for future surveys

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

DOI:https://doi.org/10.1103/PHYSREVD.82.083511· OSTI ID:21433004

De Bernardis, Francesco ^[1]; Serra, Paolo; Cooray, Asantha ^[2]; Melchiorri, Alessandro ^[1]

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1. Physics Department and INFN, Universita di Roma 'La Sapienza', Ple Aldo Moro 2, 00185, Rome (Italy)
2. Center for Cosmology, Department of Physics and Astronomy, University of California Irvine, Irvine, California 92697 (United States)

We place new constraints on the primordial local non-Gaussianity parameter f{sub NL} using recent cosmic microwave background anisotropy and galaxy clustering data. We model the galaxy power spectrum according to the halo model, accounting for a scale-dependent bias correction proportional to f{sub NL}/k{sup 2}. We first constrain f{sub NL} in a full 13 parameters analysis that includes 5 parameters of the halo model and 7 cosmological parameters. Using the WMAP7 CMB data and the SDSS DR4 galaxy power spectrum, we find f{sub NL}=171{sub -139}{sup +140} at 68% C.L. and -69<f{sub NL}<+492 at 95% C.L. We discuss the degeneracies between f{sub NL} and other cosmological parameters. Including SN-Ia data and priors on H{sub 0} from Hubble Space Telescope observations we find a stronger bound: -35<f{sub NL}<+479 at 95%. We also fit the more recent SDSS DR7 halo power spectrum data finding, for a {Lambda}CDM+f{sub NL} model, f{sub NL}=-93{+-}128 at 68% C.L. and -327<f{sub NL}<+177 at 95% C.L. We finally forecast the constraints on f{sub NL} from future surveys as EUCLID and from CMB missions as Planck showing that their combined analysis could detect f{sub NL{approx}}5.

• OSTI ID: 21433004
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
CORRECTIONS
COSMOLOGICAL MODELS
ELECTROMAGNETIC RADIATION
GALAXIES
GALAXY CLUSTERS
MATHEMATICAL MODELS
MICROWAVE RADIATION
RADIATIONS
RELICT RADIATION
SIMULATION
SPACE
SPECTRA