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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1010.2651 (astro-ph)
[Submitted on 13 Oct 2010 (v1), last revised 27 Jan 2011 (this version, v3)]

Title:A Slight Excess of Large Scale Power from Moments of the Peculiar Velocity Field

Authors:Edward Macaulay, Hume A. Feldman, Pedro G. Ferreira, Michael J. Hudson, Richard Watkins
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Abstract:The peculiar motions of galaxies can be used to infer the distribution of matter in the Universe. It has recently been shown that measurements of the peculiar velocity field indicates an anomalously high bulk flow of galaxies in our local volume. In this paper we find the implications of the high bulk flow for the power spectrum of density fluctuations. We find that analyzing only the dipole moment of the velocity field yields an average power spectrum amplitude which is indeed much higher than the LCDM value. However, by also including shear and octupole moments of the velocity field, and marginalizing over possible values for the growth rate, an average power spectrum amplitude which is consistent with LCDM is recovered. We attempt to infer the shape of the matter power spectrum from moments of the velocity field, and find a slight excess of power on scales ~ h-1 Gpc.
Comments: 6 pages,6 figures, updated to match accepted version
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:1010.2651 [astro-ph.CO]
  (or arXiv:1010.2651v3 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1010.2651
Related DOI: https://doi.org/10.1111/j.1365-2966.2011.18426.x

Submission history

From: Edward Macaulay [view email]
[v1] Wed, 13 Oct 2010 13:02:10 UTC (462 KB)
[v2] Thu, 14 Oct 2010 15:34:05 UTC (144 KB)
[v3] Thu, 27 Jan 2011 15:06:41 UTC (142 KB)
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