CDM Models with a Smooth Component
Michael Turner, Martin White
Abstract
The inflationary prediction of a flat Universe is at odds with current determinations of the matter density (OmegaM~0.2-0.4). This dilemma can be resolved if a smooth component contributes the remaining energy density (OmegaX=1-OmegaM). We parameterize the smooth component by its equation of state, pX=w rhoX, and show that xCDM with w~-0.6, OmegaM~0.3 and h~0.7 is the best fit to all present cosmological data. Together, the position of the peak in the CMB angular power spectrum and the Type Ia supernova magnitude-redshift diagram provide a crucial test of xCDM.
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