Abstract
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 fNL 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.
Original language | English |
---|---|
Article number | 022 |
Pages (from-to) | 022 |
Journal | Journal of Cosmology and Astroparticle Physics |
Volume | 2014 |
Issue number | 8 |
Early online date | 11 Aug 2014 |
DOIs | |
Publication status | Published - Aug 2014 |
Keywords
- cosmological parameters from LSS
- gravity
- power spectrum
- redshift surveys
- RCUK
- STFC
- ST/H002774/1 & ST/K0090X/1