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

Raccanelli, Alvise and Bertacca, Daniele and Doré, Olivier and Maartens, Roy (2014) Large-scale 3D galaxy correlation function and non-Gaussianity. Journal of Cosmology and Astroparticle Physics, 2014 (8). Art. No. 022. ISSN 1475-7516.

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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_(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.

Item Type:Article
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URLURL TypeDescription DOIArticle
Doré, Olivier0000-0002-5009-7563
Additional Information:© 2014 IOP Publishing Ltd and Sissa Medialab srl. Received March 5, 2014; Revised June 27, 2014; Accepted July 10, 2014; Published August 11, 2014. We thank Nicola Bartolo, Kazuya Koyama, Marc Manera, Sabino Matarrese, Will Percival, Ashley Ross, Lado Samushia and Gianmassimo Tasinato for helpful discussions. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The work of DB and RM was supported by the South African Square Kilometre Array Project and the South African National Research Foundation. RM was also supported by the U.K. Science & Technology Facilities Council (grant nos. ST/H002774/1 and ST/K0090X/1).
Funding AgencyGrant Number
South African Square Kilometre Array ProjectUNSPECIFIED
National Research Foundation (South Africa)UNSPECIFIED
Science and Technology Facilities Council (STFC)ST/H002774/1
Science and Technology Facilities Council (STFC)ST/K0090X/1
Subject Keywords:power spectrum, redshift surveys, gravity, cosmological parameters from LSS
Issue or Number:8
Classification Code:PACS: 98.62.Py; 98.80.Cq; 04.30.-w
Record Number:CaltechAUTHORS:20141016-152141089
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Official Citation:Large-scale 3D galaxy correlation function and non-Gaussianity Alvise Raccanelli et al JCAP08(2014)022
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50459
Deposited By: Tony Diaz
Deposited On:16 Oct 2014 22:31
Last Modified:03 Oct 2019 07:23

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