New Constraint on Open Cold-Dark-Matter Models

Details New Constraint on Open Cold-Dark-Matter Models New Constraint on Open Cold-Dark-Matter Models

1998-08-28

arxiv.org/abs/astro-ph/9808320v3

Phys.Rev.Lett. 82 (1999) 4172-4175

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1103/PhysRevLett.82.4172

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 $z\simeq1$ 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.

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