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Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances, Weak Lensing, and Galaxy Correlations

C. To et al. (DES Collaboration)
Phys. Rev. Lett. 126, 141301 – Published 6 April 2021
Physics logo See synopsis: A New View of the Universe’s Dark Side
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Abstract

We present the first joint analysis of cluster abundances and auto or cross-correlations of three cosmic tracer fields: galaxy density, weak gravitational lensing shear, and cluster density split by optical richness. From a joint analysis (4×2pt+N) of cluster abundances, three cluster cross-correlations, and the auto correlations of the galaxy density measured from the first year data of the Dark Energy Survey, we obtain Ωm=0.3050.038+0.055 and σ8=0.7830.054+0.064. This result is consistent with constraints from the DES-Y1 galaxy clustering and weak lensing two-point correlation functions for the flat νΛCDM model. Consequently, we combine cluster abundances and all two-point correlations from across all three cosmic tracer fields (6×2pt+N) and find improved constraints on cosmological parameters as well as on the cluster observable-mass scaling relation. This analysis is an important advance in both optical cluster cosmology and multiprobe analyses of upcoming wide imaging surveys.

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  • Received 6 October 2020
  • Revised 7 January 2021
  • Accepted 23 February 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.141301

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

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A New View of the Universe’s Dark Side

Published 6 April 2021

The Dark Energy Survey Collaboration has updated a model of the Universe to correctly capture more galaxy measurements.

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Vol. 126, Iss. 14 — 9 April 2021

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