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Title: Cold dark energy constraints from the abundance of galaxy clusters

We constrain cold dark energy of negligible sound speed using galaxy cluster abundance observations. In contrast to standard quasi-homogeneous dark energy, negligible sound speed implies clustering of the dark energy fluid at all scales, allowing us to measure the effects of dark energy perturbations at cluster scales. We compare those models and set the stage for using non-linear information from semi-analytical modelling in cluster growth data analyses. For this, we recalibrate the halo mass function with non-linear characteristic quantities, the spherical collapse threshold and virial overdensity, that account for model and redshift-dependent behaviours, as well as an additional mass contribution for cold dark energy. Here in this paper, we present the first constraints from this cold dark matter plus cold dark energy mass function using our cluster abundance likelihood, which self-consistently accounts for selection effects, covariances and systematic uncertainties. We combine cluster growth data with cosmic microwave background, supernovae Ia and baryon acoustic oscillation data, and find a shift between cold versus quasi-homogeneous dark energy of up to 1σ. We make a Fisher matrix forecast of constraints attainable with cluster growth data from the ongoing Dark Energy Survey (DES). For DES, we predict ~ 50 percent tighter constraints on (Ωm,more » w) for cold dark energy versus wCDM models, with the same free parameters. Overall, we show that cluster abundance analyses are sensitive to cold dark energy, an alternative, viable model that should be routinely investigated alongside the standard dark energy scenario.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Center; Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Ruprecht-Karls-Univ. Heidelberg, Heidelberg (Germany)
  2. Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Center; Ludwig Maximilian Univ., Munich (Germany). Faculty of Physics; Excellence Cluster Universe, Garching (Germany); Univ. of Colorado, Boulder, CO (United States). Center for Astrophysics and Space Astronomy, Dept. of Astrophysical and Planetary Science; NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
  3. Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Center; Univ. of Edinburgh, Scotland (United Kingdom). Inst. for Astronomy
  4. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Stanford Univ., CA (United States). Dept. of Physics
  5. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Center; Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Stanford Univ., CA (United States). Dept. of Physics; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
AC02-76SF00515; NNX15AE12G; 647112
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 473; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE; European Research Council (ERC); National Aeronautics and Space Administration (NASA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: clusters: general; cosmological parameters; dark energy; large-scale structure of Universe; cosmology: observations; cosmology: theory
OSTI Identifier:
1425665