author={Martin Sahl'en and 'Inigo Zubeld'ia and Joseph I. Silk},
  journal={The Astrophysical Journal},
Combining galaxy cluster and void abundances breaks the degeneracy between mean matter density and power-spectrum normalization . For the first time for voids, we constrain and 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… 

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