Constraints on primordial non-Gaussianity from WMAP7 and luminous red galaxies power spectrum and forecast for future surveys
- Physics Department and INFN, Universita di Roma 'La Sapienza', Ple Aldo Moro 2, 00185, Rome (Italy)
- 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, Vol. 82, Issue 8; Other Information: DOI: 10.1103/PhysRevD.82.083511; (c) 2010 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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