paper

Cluster Abundance Constraints on Quintessence Models

arXiv:astro-ph/9804015 · doi:10.1086/306436

Abstract

The abundance of rich clusters is a strong constraint on the mass power spectrum. The current constraint can be expressed in the form where is the mass fluctuation on 8 Mpc scales, is the ratio of matter density to the critical density, and is model-dependent. In this paper, we determine a general expression for that applies to any models with a mixture of cold dark matter plus cosmological constant or quintessence (a time-evolving, spatially-inhomogeneous component with negative pressure) including dependence on the spectral index , the Hubble constant , and the equation-of-state of the quintessence component . The cluster constraint is combined with COBE measurements to identify a spectrum of best-fitting models. The constraint from the evolution of rich clusters is also discussed.

19 pages, 4 figures, submitted to ApJ

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