Large-Scale Bulk Motions Complicate the Hubble Diagram

Details Large-Scale Bulk Motions Complicate the Hubble Diagram Large-Scale Bulk Motions Complicate the Hubble Diagram

2006-01-17

arxiv.org/abs/astro-ph/0601377v1

Phys.Rev. D73 (2006) 103002

Astronomy and Astrophysics

Astrophysics

6 pages; 4 figures

Scientific paper

10.1103/PhysRevD.73.103002

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 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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