LISA as a dark energy probe

Details LISA as a dark energy probe LISA as a dark energy probe

2008-10-31

arxiv.org/abs/0810.5727v2

Class.Quant.Grav.26:094021,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11pages, 1 Table, minor changes in text, accepted for publication in Classical and Quantum Gravity (special issue for proceedi

Scientific paper

10.1088/0264-9381/26/9/094021

Recently it was shown that the inclusion of higher signal harmonics in the inspiral signals of binary supermassive black holes (SMBH) leads to dramatic improvements in parameter estimation with the 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 $w=p_{\rm DE}/\rho_{\rm DE}$ of dark energy. With a single binary SMBH event at $z < 1$ having appropriate masses and orientation, one would be able to constrain $w$ to within a few percent. 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.

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