Work

Cluster Abundance Constraints for Cosmological Models with a Time‐varying, Spatially Inhomogeneous Energy Component with Negative Pressure

Year: 1998

Type: article

Abstract: The abundance of rich clusters is a strong constraint on the mass power spectrum. The current constraint can be expressed in the form σ 8 Ω =0.5±0.1, where σ 8 is the rms mass fluctuation on 8 h -1 Mpc scales, Ω m is the ratio of matter density to the critical density, and γ is model dependent. In this paper, we determine a general expression for γ 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 n , the Hubble constant h , and the equation of state of the quintessence component w . The cluster constraint is combined with COBE measurements to identify a range of best-fitting models. The constraint from the evolution of rich clusters is also discussed.

Source: The Astrophysical Journal

DOI: 10.1086/306436

Authors: Limin Wang, Paul J. Steinhardt

Institution: University of Pennsylvania

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: U.S. Department of Energy, University of Pennsylvania

Award: RESEARCH IN HIGH-ENERGY PHYICS