2015/11/30 by Martin Sahlén, Íñigo Zubeldía, Joseph Silk · 3 citations
Engineering · Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Space Technology and Applications #astro-ph.CO #gr-qc
paper · pdf · doi:10.3847/2041-8205/820/1/l7
published as ApJ, 820, L7 (2016) · 13 pages, 1 figure, 2 tables. ApJL accepted, revised version. Minor changes: added clarifying remarks, discussion on redshift sensitivity and more general models. Results and conclusions unchanged
arxiv created 2016/02/24 · openalex publication_date 2016/03/14 · arxiv updated 2016/03/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Combining galaxy cluster and void abundances breaks the degeneracy between mean matter density Ω\rm m and power spectrum normalization σ8. In a first for voids, we constrain Ω\rm m = 0.21 ± 0.10 and σ8 = 0.95 ± 0.21 for a flat ΛCDM 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 also offer complementarity in scale, density, and non-linearity - of particular interest for testing modified-gravity models.