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- Sahlén, Martin, 1979-, et al.
(författare)
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Cluster-void degeneracy breaking : Modified gravity in the balance
- 2018
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Ingår i: Physical Review D. Particles and fields. - : American Physical Society. - 0556-2821 .- 1089-4918. ; 97
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Tidskriftsartikel (refereegranskat)abstract
- Combining galaxy cluster and void abundances is a novel, powerful way to constrain deviations from general relativity and the Lambda CDM model. For a flat wCDM model with growth of large-scale structure parametrized by the redshift-dependent growth index gamma(z) = gamma(0) + gamma(1)z/(l + z) of linear matter perturbations, combining void and cluster abundances in future surveys with Euclid and the four-meter multiobject spectroscopic telescope could improve the figure of merit for (w, gamma(0),gamma(1)) by a factor of 20 compared to individual abundances. In an ideal case, improvement on current cosmological data is a figure of merit factor 600 or more.
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