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Advances in Astronomy
Volume 2010 (2010), Article ID 768675, 15 pages
http://dx.doi.org/10.1155/2010/768675
Review Article

Non-Gaussianity from Large-Scale Structure Surveys

Instituci├│ Catalana de Recerca i Estudis Avan├žat (ICREA) & Instituto de Ciencias del Cosmos, Universitat de Barcelona-IEEC (ICC-UB), Marti i Franques 1, 08028 Barcelona, Spain

Received 27 January 2010; Accepted 18 March 2010

Academic Editor: Dragan Huterer

Copyright © 2010 Licia Verde. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With the advent of galaxy surveys which provide large samples of galaxies or galaxy clusters over a volume comparable to the horizon size (SDSS-III, HETDEX, Euclid, JDEM, LSST, Pan-STARRS, CIP, etc.) or mass-selected large cluster samples over a large fraction of the extra-galactic sky (Planck, SPT, ACT, CMBPol, B-Pol), it is timely to investigate what constraints these surveys can impose on primordial non-Gaussianity. I illustrate here three different approaches: higher-order correlations of the three dimensional galaxy distribution, abundance of rare objects (extrema of the density distribution), and the large-scale clustering of halos (peaks of the density distribution). Each of these avenues has its own advantages, but, more importantly, these approaches are highly complementary under many respects.