Large-scale bulk motions complicate the Hubble diagram

Asantha Cooray and Robert R. Caldwell
Phys. Rev. D 73, 103002 – Published 15 May 2006

Abstract

We investigate the extent to which correlated distortions of the luminosity distance-redshift relation due to large-scale bulk flows limit the precision with which cosmological parameters can be measured. In particular, peculiar velocities of type 1a supernovae at low redshifts, z<0.2, may prevent a sufficient calibration of the Hubble diagram necessary to measure the dark energy equation of state to better than 10%, and diminish the resolution of the equation of state time-derivative projected for planned surveys. We consider similar distortions of the angular-diameter distance, as well as the Hubble constant. We show that the measurement of correlations in the large-scale bulk flow at low redshifts using these distance indicators may be possible with a cumulative signal-to-noise ratio of order 7 in a survey of 300 type 1a supernovae spread over 20 000 square degrees.

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  • Received 17 January 2006

DOI:https://doi.org/10.1103/PhysRevD.73.103002

©2006 American Physical Society

Authors & Affiliations

Asantha Cooray

  • Center for Cosmology, Department of Physics and Astronomy, University of California, Irvine, California 92697, USA

Robert R. Caldwell

  • Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, New Hampshire 03755, USA

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Vol. 73, Iss. 10 — 15 May 2006

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