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Title:
Constraining dark energy with clusters: Complementarity with other probes
Authors:
Cunha, Carlos; Huterer, Dragan; Frieman, Joshua A.
Affiliation:
AA(Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109-1040, USA), AB(Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109-1040, USA), AC(Center for Particle Astrophysics, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA; Kavli Institute for Cosmological Physics, The University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA)
Publication:
Physical Review D, vol. 80, Issue 6, id. 063532 (PhRvD Homepage)
Publication Date:
09/2009
Origin:
APS
Keywords:
Dark energy, Galaxy clusters
PACS Keywords:
Dark energy, Galaxy clusters
DOI:
10.1103/PhysRevD.80.063532
Bibliographic Code:
2009PhRvD..80f3532C

Abstract

The Figure of Merit Science Working Group recently forecast the constraints on dark energy that will be achieved prior to the Joint Dark Energy Mission by ground-based experiments that exploit baryon acoustic oscillations, type Ia supernovae, and weak gravitational lensing. We show that cluster counts from ongoing and near-future surveys should provide robust, complementary dark energy constraints. In particular, we find that optimally combined optical and Sunyaev-Zel’dovich effect cluster surveys should improve the Dark Energy Task Force figure of merit for pre-Joint Dark Energy Mission projects by a factor of 2 even without prior knowledge of the nuisance parameters in the cluster mass-observable relation. Comparable improvements are achieved in the forecast precision of parameters specifying the principal component description of the dark energy equation of state parameter, as well as in the growth index γ. These results indicate that cluster counts can play an important complementary role in constraining dark energy and modified gravity even if the associated systematic errors are not strongly controlled.
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