Constraints on primordial non-Gaussianity from WMAP7 and Luminous Red Galaxies power spectrum and forecast for future surveys

Abstract

We place new constraints on the primordial local non-Gaussianity parameter f_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_NL/k^2. We first constrain f_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_NL=171\pm+140 at 68% C.L. and -69<f_NL<+492 at 95% C.L.. We discuss the degeneracies between f_NL and other cosmological parameters. Including SN-Ia data and priors on H_0 from Hubble Space Telescope observations we find a stronger bound: -35<f_NL<+479 at 95% C.L.. We also fit the more recent SDSS DR7 halo power spectrum data finding, for a Λ-CDM+f_NL model, f_NL=-93\pm128 at 68% C.L. and -327<f_{NL}<+177 at 95% C.L.. We finally forecast the constraints on f_NL from future surveys as EUCLID and from CMB missions as Planck showing that their combined analysis could detect f_NL\sim 5.

10 pages, 5 figures, 3 tables

References in corpus (17)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• A Redetermination of the Hubble Constant with the Hubble Space Telescope from a Differential Distance Ladder
• Cosmological Constraints from the Clustering of the Sloan Digital Sky Survey DR7 Luminous Red Galaxies
• Non-Gaussianities in two-field inflation
• A numerical study of non-gaussianity in the curvaton scenario
• An Estimate of the Primordial Non-Gaussianity Parameter f_NL Using the Needlet Bispectrum from WMAP
• Primordial Non-Gaussianity and the NRAO VLA Sky Survey
• Cosmological Parameters Degeneracies and Non-Gaussian Halo Bias
• Non-Gaussian halo assembly bias
• A highly obscured and strongly clustered galaxy population discovered with the Spitzer Space Telescope
• Luminous Red Galaxy Halo Density Field Reconstruction and Application to Large Scale Structure Measurements
• Non-Gaussianity in WMAP Data Due to the Correlation of CMB Lensing Potential with Secondary Anisotropies
• DUNE: The Dark Universe Explorer

Cited by in corpus (9)

• Simultaneous Falsification of LCDM and Quintessence with Massive, Distant Clusters
• Radio Galaxy populations and the multi-tracer technique: pushing the limits on primordial non-Gaussianity
• On Classification of Models of Large Local-Type Non-Gaussianity
• Large and strong scale dependent bispectrum in single field inflation from a sharp feature in the mass
• Nonlinear clustering in models with primordial non-Gaussianity: the halo model approach
• Systematic effects in large-scale angular power spectra of photometric quasars and implications for constraining primordial nongaussianity
• Non-Gaussianity Constraints using Future Radio Continuum Surveys and the Multi-Tracer Technique
• Probing Primordial Non-Gaussianity with Weak Lensing Minkowski Functionals
• Probing primordial non-Gaussianity: The 3D Bispectrum of Ly-alpha forest and the redshifted 21-cm signal from the post reionization epoch