Tilted cold dark matter models confront the cosmic microwave background and the galaxy peculiar velocity field

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Dark Matter, Galactic Evolution, Relic Radiation, Velocity Distribution, Astronomical Models, Gravitational Waves

Scientific paper

We study tilted cold dark matter (CDM) models, that is Omega(0) = 1 models with a primordial spectral index n less than about 1. We test these models against three experiments on the cosmic microwave background anisotropy at 7 arcmin, 3 deg and 6 deg and against measurements of galaxy peculiar velocities on large scales. These observations together suggest that the whole class of tilted CDM models with n less than 1 can be ruled out, for any value of the biasing parameter b.

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