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

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

2011-06-16

arxiv.org/abs/1106.3327v3

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

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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