Precision cosmology from future lensed gravitational wave and electromagnetic signals

Kai Liao, Xi-Long Fan (), Xuheng Ding, Marek Biesiada and Zong-Hong Zhu ()
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Kai Liao: Wuhan University
Xi-Long Fan: Hubei University of Education
Xuheng Ding: Wuhan University
Marek Biesiada: Beijing Normal University
Zong-Hong Zhu: Wuhan University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract The standard siren approach of gravitational wave cosmology appeals to the direct luminosity distance estimation through the waveform signals from inspiralling double compact binaries, especially those with electromagnetic counterparts providing redshifts. It is limited by the calibration uncertainties in strain amplitude and relies on the fine details of the waveform. The Einstein telescope is expected to produce 104–105 gravitational wave detections per year, 50–100 of which will be lensed. Here, we report a waveform-independent strategy to achieve precise cosmography by combining the accurately measured time delays from strongly lensed gravitational wave signals with the images and redshifts observed in the electromagnetic domain. We demonstrate that just 10 such systems can provide a Hubble constant uncertainty of 0.68% for a flat lambda cold dark matter universe in the era of third-generation ground-based detectors.

Date: 2017
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DOI: 10.1038/s41467-017-01152-9

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