CLUSTER–VOID DEGENERACY BREAKING: DARK ENERGY, PLANCK, AND THE LARGEST CLUSTER AND VOID

@article{Sahlen2016CLUSTERVOIDDB,
  title={CLUSTER–VOID DEGENERACY BREAKING: DARK ENERGY, PLANCK, AND THE LARGEST CLUSTER AND VOID},
  author={Martin Sahl'en and {\'I}{\~n}igo Zubeld{\'i}a and Joseph I. Silk},
  journal={The Astrophysical Journal Letters},
  year={2016},
  volume={820}
}
Combining galaxy cluster and void abundances breaks the degeneracy between mean matter density &OHgr; m ?> and power-spectrum normalization &sgr; 8 ?> . For the first time for voids, we constrain &OHgr; m = 0.21 ± 0.10 ?> and &sgr; 8 = 0.95 ± 0.21 ?> for a flat Λ CDM universe, using extreme-value statistics on the claimed largest cluster and void. The Planck-consistent results detect dark energy with two objects, independently of other dark energy probes. Cluster–void studies are also… 
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17 Citations

Cluster-Void Degeneracy Breaking: Modified Gravity in the Balance
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The KBC void and Hubble tension contradict ΛCDM on a Gpc scale − Milgromian dynamics as a possible solution
The KBC void is a local underdensity with the observed relative density contrast δ ≡ 1 − ρ/ρ0 = 0.46 ± 0.06 between 40 and 300 Mpc around the Local Group. If mass is conserved in the Universe, such…
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Within the Halo Model of large scale structure, all matter is contained in dark matter halos. This simple yet powerful framework has been broadly applied to multiple data sets and enriched our…
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Using mapping from dark matter halos to galaxy properties based on hydrodynamical simulations, we explore the impact of galaxy properties on the void size function and the void–galaxy correlation…
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. The search for a particle dark matter signal in terms of radiation produced by dark matter annihilation or decay has to cope with the extreme faintness of the predicted signal and the presence of…
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We investigate the necessary methodology to optimally measure the baryon acoustic oscillation (BAO) signal, from voids based on galaxy redshift catalogues. To this end, we study the dependency of the…
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