Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 4, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2019/04/033
Keywords
gravitational waves; sources; gravitational waves; theory
Funding
- National Natural Science Foundation of China [11633001, 11373014]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB23000000]
- Interdiscipline Research Funds of Beijing Normal University
- China Postdoctoral Science Foundation [2017M622501]
- Key Foreign Expert Program for the Central Universities [X2018002]
- National Natural Science Foundation of China (NSFC) [11603015]
- NSFC [11505008]
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The purpose of this work is to investigate the prospects of using the future standard siren data without redshift measurements to constrain cosmological parameters. With successful detections of gravitational wave (GW) signals an era of GW astronomy has begun. Unlike the electromagnetic domain, GW signals allow direct measurements of luminosity distances to the sources, while their redshifts remain to be measured by identifying electromagnetic counterparts. This leads to significant technical problems for almost all possible BH-BH systems. It is the major obstacle to cosmological applications of GW standard sirens. In this paper, we introduce the general framework of using luminosity distances alone for cosmological inference. The idea is to use the prior knowledge of the redshift probability distribution for coalescing sources from the intrinsic merger rates assessed with population synthesis codes. Then the posterior probability distributions for cosmological parameters can be calculated. We demonstrate the performance of our method on the simulated mock data and show that the luminosity distance measurement would enable an accurate determination of cosmological parameters up to 20% uncertainty level. We also find that in order to infer H-0 to 1% level with flat ACDM model, we need about 10(5) events.
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