Van Den Broeck, Chris  ORCID: https://orcid.org/0000-0001-6800-4006, Trias, M., Sathyaprakash, Bangalore Suryanarayana ORCID: https://orcid.org/0000-0003-3845-7586 and Sintes, A. M.
2010.
Weak lensing effects in the measurement of the dark energy equation of state with LISA.
Physical Review D - Particles, Fields, Gravitation and Cosmology
81
(12)
, 124031.
10.1103/PhysRevD.81.124031
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Abstract
The Laser Interferometer Space Antenna’s (LISA’s) observation of supermassive binary black holes (SMBBH) could provide a new tool for precision cosmography. Inclusion of subdominant signal harmonics in the inspiral signal allows for high-accuracy sky localization, dramatically improving the chances of finding the host galaxy and obtaining its redshift. A SMBBH merger can potentially have component masses from a wide range (105–108M⊙) over which parameter accuracies vary considerably. We perform an in-depth study in order to understand (i) what fraction of possible SMBBH mergers allow for sky localization, depending on the parameters of the source, and (ii) how accurately w can be measured when the host galaxy can be identified. We also investigate how accuracies on all parameters improve when a knowledge of the sky position can be folded into the estimation of errors. We find that w can be measured to within a few percent in most cases, if the only error in measuring the luminosity distance is due to LISA’s instrumental noise and the confusion background from Galactic binaries. However, weak lensing-induced errors will severely degrade the accuracy with which w can be obtained, emphasizing that methods to mitigate weak lensing effects would be required to take advantage of LISA’s full potential.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Subjects: | Q Science > QB Astronomy |
| Additional Information: | 15 pp. |
| Publisher: | American Physical Society |
| ISSN: | 1550-7998 |
| Last Modified: | 12 May 2023 05:50 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/21789 |
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