Non-Gaussianity from Large-Scale Structure Surveys

Details Non-Gaussianity from Large-Scale Structure Surveys Non-Gaussianity from Large-Scale Structure Surveys

2010-01-28

arxiv.org/abs/1001.5217v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 8 figures, submitted to the special issue "Testing the Gaussianity and Statistical Isotropy of the Universe" of Adva

Scientific paper

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.

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