New Constraint on Open Cold-Dark-Matter Models

Abstract

We calculate the large-angle cross-correlation between the cosmic-microwave-background (CMB) temperature and the x-ray-background (XRB) intensity expected in an open Universe with cold dark matter (CDM) and a nearly scale-invariant spectrum of adiabatic density perturbations. Results are presented as a function of the nonrelativistic-matter density ${\Omega }_0$ (in units of the critical density) and the x-ray bias $b_x$ (evaluated at a redshift $z\simeq 1$ in evolving-bias models) for both an open Universe and a flat cosmological-constant Universe. Recent experimental upper limits to the amplitude of this cross-correlation provide a new constraint to the ${\Omega }_0$-$b_x$ parameter space that open-CDM models (and the open-inflation models that produce them) must satisfy.

4 pages, LaTeX. Revised version contains additional figure that clarifies new constraint. (To appear in PRL.)

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