Abstract
We investigate the power spectrum of velocity fluctuations in the universe starting from four different measures of velocity: the power spectrum of velocity fluctuations from peculiar velocities of galaxies, the rms peculiar velocity of galaxy clusters, the power spectrum of velocity fluctuations from the power spectrum of density fluctuations in the galaxy distribution, and the bulk velocity from peculiar velocities of galaxies. There are various way of interpreting the observational data.
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