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

Abstract

We study tilted cold dark matter (CDM) models, that is {OMEGA}_0_ = 1 models with a primordial spectral index n <~ 1. We test these models against three experiments on the cosmic microwave background anisotropy at 7', 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 <= 1 can be ruled out, for any value of the biasing parameter b. Subject headings cosmic microwave background - dark matter - galaxies: formation

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