Weak lensing effects in the measurement of the dark energy equation of state with LISA

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:	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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