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Title: Large-scale 3D galaxy correlation function and non-Gaussianity

We investigate the properties of the 2-point galaxy correlation function at very large scales, including all geometric and local relativistic effects --- wide-angle effects, redshift space distortions, Doppler terms and Sachs-Wolfe type terms in the gravitational potentials. The general three-dimensional correlation function has a nonzero dipole and octupole, in addition to the even multipoles of the flat-sky limit. We study how corrections due to primordial non-Gaussianity and General Relativity affect the multipolar expansion, and we show that they are of similar magnitude (when f{sub NL} is small), so that a relativistic approach is needed. Furthermore, we look at how large-scale corrections depend on the model for the growth rate in the context of modified gravity, and we discuss how a modified growth can affect the non-Gaussian signal in the multipoles.
Authors:
;  [1] ; ;  [2]
  1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA 91109 (United States)
  2. Physics Department, University of the Western Cape, Cape Town 7535 (South Africa)
Publication Date:
OSTI Identifier:
22373407
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CORRECTIONS; CORRELATION FUNCTIONS; DIPOLES; GALAXIES; GENERAL RELATIVITY THEORY; GEOMETRY; GRAVITATION; OCTUPOLES; RED SHIFT; RELATIVISTIC RANGE; SIGNALS; SKY; SPACE