LISA as a dark energy probe

K. G. Arun, Chandra Kant Mishra, Chris Van Den Broeck, B. R. Iyer, B. S. Sathyaprakash, Siddhartha Sinha

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Recently, it has been shown that the inclusion of higher singnal harmonics in the inspiral signals of binary supermassive black holes (SMBH) leads to dramatic improvements in the parameter estimation with Laser Interferometer Space Antenna (LISA). In particular, the angular resolution becomes good enough to identify the host galaxy or galaxy cluster, in which case the redshift can be determined by electromagnetic means. The gravitational wave signal also provides the luminosity distance with high accuracy, and the relationship between this and the redshift depends sensitively on the cosmological parameters, such as the equation-of-state parameter w = PDE/ρDE of dark energy. Using binary SMBH events at z < 1 with appropriate masses and orientations, one would be able to constrain w to within a few per cent. We show that, if the measured sky location is folded into the error analysis, the uncertainty on w goes down by an additional factor of 2-3, leaving weak lensing as the only limiting factor in using LISA as a dark energy probe.

Original languageEnglish (US)
Article number094021
JournalClassical and Quantum Gravity
Issue number9
StatePublished - May 7 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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