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A joint 2- and 3-point clustering analysis of the VIPERS PDR2 catalogue at z ∼ 1: breaking the degeneracy of cosmological parameters

Authors: A. Veropalumbo; I. Sáez-Casares; E. Branchini; B. Granett; L. Guzzo; F. Marulli; M. Moresco; +4 Authors

A joint 2- and 3-point clustering analysis of the VIPERS PDR2 catalogue at z ∼ 1: breaking the degeneracy of cosmological parameters

Abstract

ABSTRACT We measure the galaxy two- and three-point correlation functions at z = [0.5, 0.7] and z = [0.7, 0.9], from the Public Data Release 2 (PDR2) of the VIMOS Public Extragalactic Redshift Survey (VIPERS). We model the two statistics including a non-linear one-loop model for the two-point function and a tree-level model for the three-point function, and perform a joint likelihood analysis. The entire process and non-linear corrections are tested and validated through the use of the 153 highly realistic VIPERS mock catalogues, showing that they are robust down to scales as small as 10 $h^{-1} \, \mathrm{Mpc}$. The mocks are also adopted to compute the covariance matrix that we use for the joint two- and three-point analysis. Despite the limited statistics of the two (volume-limited) subsamples analysed, we demonstrate that such a combination successfully breaks the degeneracy existing at two-point level between clustering amplitude σ8, linear bias b1, and the linear growth rate of fluctuations f. For the latter, in particular, we measure $f(z=0.61)=0.64^{+0.55}_{-0.37}$ and f(z = 0.8) = 1.0 ± 1.0, while the amplitude of clustering is found to be σ8(z = 0.61) = 0.50 ± 0.12 and $\sigma _8(z=0.8)=0.39^{+0.11}_{-0.13}$. These values are in excellent agreement with the extrapolation of a Planck cosmology.

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Italy, Italy, Italy, Italy, France
Keywords

Cosmology and Nongalactic Astrophysics (astro-ph.CO), Large-scale structure of Universe, Galaxies: statistics, Cosmology: observations, FOS: Physical sciences, cosmology: observations; galaxies: statistics; large-scale structure of Universe;, cosmology: observations; galaxies: statistics; large-scale structure of Universe, statistics [Galaxies], cosmology: observations, Large-scale structure of the universe, large-scale structure of Universe, [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], observations [Cosmology], galaxies: statisticslarge-scale structure of Universecosmology: observations, galaxies: statistics, Astrophysics - Cosmology and Nongalactic Astrophysics

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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