Limits on cold dark matter cosmologies from new anisotropy bounds on the cosmic microwave background

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, Background Radiation, Baryons, Cosmic Rays, Cosmology, Dark Matter, Anisotropy, Digital Simulation, Maximum Likelihood Estimates, Microwaves, Monte Carlo Method, Polar Regions

Scientific paper

A self-consistent method is presented for comparing theoretical predictions of and observational upper limits on CMB anisotropy. New bounds on CDM cosmologies set by the UCSB South Pole experiment on the 1 deg angular scale are presented. An upper limit of 4.0 x 10 to the -5th is placed on the rms differential temperature anisotropy to a 95 percent confidence level and a power of the test beta = 55 percent. A lower limit of about 0.6/b is placed on the density parameter of cold dark matter universes with greater than about 3 percent baryon abundance and a Hubble constant of 50 km/s/Mpc, where b is the bias factor, equal to unity only if light traces mass.

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