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Combining galaxy cluster and void abundances breaks the degeneracy betweenmean matter density $\Omega_{\rm m}$ and power spectrum normalization$\sigma_8$. In a first for voids, we constrain $\Omega_{\rm m} = 0.21 \pm 0.10$and $\sigma_8 = 0.95 \pm 0.21$ for a flat $\Lambda$CDM universe, usingextreme-value statistics on the claimed largest cluster and void. ThePlanck-consistent results detect dark energy with two objects, independently ofother dark energy probes. Cluster-void studies also offer complementarity inscale, density, and non-linearity - of particular interest for testingmodified-gravity models.

Cluster-Void Degeneracy Breaking: Dark Energy, Planck and the Largest Cluster & Void