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Anisotropies of Gravitational-Wave Standard Sirens as a New Cosmological Probe without Redshift Information

Namikawa, Toshiya and Nishizawa, Atsushi and Taruya, Atsushi (2016) Anisotropies of Gravitational-Wave Standard Sirens as a New Cosmological Probe without Redshift Information. Physical Review Letters, 116 (12). Art. No. 121302. ISSN 0031-9007. doi:10.1103/PhysRevLett.116.121302.

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Gravitational waves (GWs) from compact binary stars at cosmological distances are promising and powerful cosmological probes, referred to as the GW standard sirens. With future GW detectors, we will be able to precisely measure source luminosity distances out to a redshift z∼5. To extract cosmological information, previously proposed cosmological studies using the GW standard sirens rely on source redshift information obtained through an extensive electromagnetic follow-up campaign. However, the redshift identification is typically time consuming and rather challenging. Here, we propose a novel method for cosmology with the GW standard sirens free from the redshift measurements. Utilizing the anisotropies of the number density and luminosity distances of compact binaries originated from the large-scale structure, we show that, once GW observations will be well established in the future, (i) these anisotropies can be measured even at very high redshifts (z≥2), where the identification of the electromagnetic counterpart is difficult, (ii) the expected constraints on the primordial non-Gaussianity with the Einstein Telescope would be comparable to or even better than the other large-scale structure probes at the same epoch, and (iii) the cross-correlation with other cosmological observations is found to have high-statistical significance, providing additional cosmological information at very high redshifts.

Item Type:Article
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URLURL TypeDescription Paper
Nishizawa, Atsushi0000-0003-3562-0990
Additional Information:© 2016 American Physical Society. Received 21 November 2015; revised manuscript received 7 December 2015; published 24 March 2016. This work is supported in part by JSPS Postdoctoral Fellowships for Research Abroad No. 26-142 (T. N.)., No. 25-180 (A. N.). This work is in part supported by MEXT KAKENHI (15H05889 for A. T.).
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)26-142
Japan Society for the Promotion of Science (JSPS)25-180
Ministry of Education, Culture, Sports, Science and Technology (MEXT)15H05889
Issue or Number:12
Record Number:CaltechAUTHORS:20160418-150855764
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Official Citation:Anisotropies of Gravitational-Wave Standard Sirens as a New Cosmological Probe without Redshift Information Toshiya Namikawa, Atsushi Nishizawa, and Atsushi Taruya Phys. Rev. Lett. 116, 121302 – Published 24 March 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66255
Deposited By: Tony Diaz
Deposited On:18 Apr 2016 22:17
Last Modified:10 Nov 2021 23:55

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