Tracing the redshift evolution of Hubble parameter with gravitational-wave standard sirens

Details Tracing the redshift evolution of Hubble parameter with gravitational-wave standard sirens Tracing the redshift evolution of Hubble parameter with gravitational-wave standard sirens

2010-11-23

arxiv.org/abs/1011.5000v2

Phys.Rev.D83:084045,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 6 figures

Scientific paper

10.1103/PhysRevD.83.084045

Proposed space-based gravitational-wave detectors such as BBO and DECIGO can detect ~10^6 neutron-star binaries and determine luminosity distance to the binaries with a high precision. Combining the luminosity distance and electromagnetically-derived redshift, one would be able to probe cosmological expansion out to high redshift. In this paper, we show that the Hubble parameter as a function of redshift can be directly measured with monopole and dipole components of the luminosity distance on the sky. As a result, the measurement accuracies of the Hubble parameter in each redshift bin up to z=1 are 3-14 %, 1.5-8 %, and 0.8-4% for the observation time 1 yr, 3 yr, and 10 yr, respectively.

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