Cosmic Mach Number: A Sensitive Probe for the Growth of Structure

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

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4.3 pages, 3 figures; calculations of the cosmic variance of CMN and Fisher forecast added; conclusion unchanged

Scientific paper

In this Letter, we investigate the potential power of the Cosmic Mach Number (CMN), which is the ratio between the mean velocity and the velocity dispersion of galaxies as a function of cosmic scales, to constrain cosmologies. We first measure the CMN from 5 catalogues of galaxy peculiar velocity surveys at low redshift (0.002

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