2016ApJ...820L...7S

Query : 2016ApJ...820L...7S

2016ApJ...820L...7S - Astrophys. J., 820, L7 (2016/March-3)

Cluster-void degeneracy breaking: dark energy, Planck, and the largest cluster and void.

SAHLEN M., ZUBELDIA I. and SILK J.

Abstract (from CDS):

Combining galaxy cluster and void abundances breaks the degeneracy between mean matter density Ωm and power-spectrum normalization σ8. For the first time for voids, we constrain Ωm=0.21±0.10 and σ8=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 complementary in scale, density, and nonlinearity, and are of particular interest for testing modified-gravity models.

Abstract Copyright: ∼

Journal keyword(s): cosmological parameters - cosmology: theory - dark energy - galaxies: clusters: individual: ACT-CL J0102-4915 - large-scale structure of universe - methods: statistical

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ACT-CL J0102-4915 ClG 01 02 52.50 -49 14 58.0           ~ 230 0
2 NAME Local Void vid 18 38 +18.0           ~ 200 0

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