Galaxy number counts to second order and their bispectrum

Journal Article · Mon Dec 01 00:00:00 EST 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/12/017· OSTI ID:22382082

Dio, Enea Di; Durrer, Ruth; Marozzi, Giovanni; Montanari, Francesco ^[1]

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1. Université de Genève, Département de Physique Théorique and CAP, 24 quai Ernest-Ansermet, CH-1211 Genève 4 (Switzerland)

We determine the number counts to second order in cosmological perturbation theory in the Poisson gauge and allowing for anisotropic stress. The calculation is performed using an innovative approach based on the recently proposed ''geodesic light-cone'' gauge. This allows us to determine the number counts in a purely geometric way, without using Einstein's equation. The result is valid for general dark energy models and (most) modified gravity models. We then evaluate numerically some relevant contributions to the number counts bispectrum. In particular we consider the terms involving the density, redshift space distortion and lensing.

• OSTI ID: 22382082
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
DENSITY
EINSTEIN FIELD EQUATIONS
GALAXIES
GEOMETRY
GRAVITATION
LIGHT CONE
NONLUMINOUS MATTER
PERTURBATION THEORY
RED SHIFT
STRESSES