The inflationary prediction of a flat Universe is at odds with current determinations of the matter density (ΩM0.2-0.4). This dilemma can be resolved if a smooth component contributes the remaining energy density (ΩX=1-ΩM). We parametrize the smooth component by its equation of state, pX=wρX, and show that XCDM with w-0.6, ΩM0.3, and h0.7 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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Turner et al. (1997) studied this question.
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