4 Matching Results

Search Results

Advanced search parameters have been applied.
in creator/contributor: "Sefusatti, Emiliano"  
Results: 1 - 4
open access

Cosmology and the Bispectrum

Description: The present spatial distribution of galaxies in the Universe is non-Gaussian, with 40% skewness in 50 h{sup -1} Mpc spheres, and remarkably little is known about the information encoded in it about cosmological parameters beyond the power spectrum. In this work they present an attempt to bridge this gap by studying the bispectrum, paying particular attention to a joint analysis with the power spectrum and their combination with CMB data. They address the covariance properties of the power spect… more
Date: April 1, 2006
Creator: Sefusatti, Emiliano; Crocce, Martin; Pueblas, Sebastian & Scoccimarro, Roman
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys

Description: Galaxy cluster surveys will be a powerful probe of dark energy. At the same time, cluster abundances is sensitive to any non-Gaussianity of the primordial density field. It is therefore possible that non-Gaussian initial conditions might be misinterpreted as a sign of dark energy or at least degrade the expected constraints on dark energy parameters. To address this issue, we perform a likelihood analysis of an ideal cluster survey similar in size and depth to the upcoming South Pole Telescope/… more
Date: September 1, 2006
Creator: Sefusatti, Emiliano; Vale, Chris; Kadota, Kenji & Frieman, Joshua
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and non-linear galaxy bias

Description: The greatest challenge in the interpretation of galaxy clustering data from any surveys is galaxy bias. Using a simple Fisher matrix analysis, we show that the bispectrum provides an excellent determination of linear and non-linear bias parameters of intermediate and high-z galaxies, when all measurable triangle configurations down to mildly non-linear scales, where perturbation theory is still valid, are included. The bispectrum is also a powerful probe of primordial non-Gaussianity. The plann… more
Date: May 1, 2007
Creator: Sefusatti, Emiliano; /Fermilab; Komatsu, Eiichiro & /Texas U., Astron. Dept.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen