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Published May 24, 1999 | Published
Journal Article Open

New constraint on open cold-dark-matter models


We calculate the large-angle cross correlation between the cosmic-microwave-background temperature and the x-ray-background 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 Ω0 and the x-ray bias bx 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 Ω0-bx parameter space that open-CDM models (and the open-inflation models that produce them) must satisfy.

Additional Information

© 1999 The American Physical Society. Received 28 August 1998; revised 10 February 1999. We thank S. Dodelson, D. Helfand, and D. Spergel for useful comments. A.K. was supported by the Columbia Rabi Scholars Program which is funded by the Kann Rasmussen Foundation. M.K. was supported by a U.S. DOE OJI Award, DE-FG02-92ER40699, NASA Grant No. NAG5-3091, and the Alfred P. Sloan Foundation.

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