Constraining Dark Energy with Clusters: Complementarity with Other Probes
arXiv:0904.1589 · doi:10.1103/PhysRevD.80.063532
Abstract
The Figure of Merit Science Working Group (FoMSWG) recently forecast the constraints on dark energy that will be achieved prior to the Joint Dark Energy Mission (JDEM) by ground-based experiments that exploit baryon acoustic oscillations, type Ia supernovae, and weak gravitational lensing. We show that cluster counts from on-going 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 (DETF) figure of merit for pre-JDEM projects by a factor of two 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 gamma. 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.
6 pages, 3 figures, accepted to Phys. Rev. D. Discussion section added
References in corpus (5)
- Dark Energy and the Accelerating Universe
- Virial Scaling of Massive Dark Matter Halos: Why Clusters Prefer a High Normalization Cosmology
- Constraining the Scatter in the Mass-Richness Relation of maxBCG Clusters With Weak Lensing and X-ray Data
- Photometric Redshift Requirements for Self-Calibration of Cluster Dark Energy Studies
- The Effects of Halo Assembly Bias on Self-Calibration in Galaxy Cluster Surveys