http://arxiv.org/abs/2006.11525
The first multi-messenger gravitational-wave observation of a binary neutron star merger allowed for the first distance-ladder independent measure of Hubble’s constant, albeit with an uncertainty of $\sim15\%$ at the 68\% credible level. We show that a single future observation of a binary neutron star merger with a network of detectors sensitive to the post-merger remnant at a few kHz, and commensurate improvement in cosmological redshift measurements, will allow for percent-level uncertainties in measurement of Hubble’s constant. To achieve such sensitivity, higher-order modes must be taken into account to break the intrinsic degeneracy between luminosity distance and inclination of the source. We show how higher-order modes can be exploited in astrophysical parameter estimation in both the inspiral phase, and also the post-merger remnant. While former suffices in the case of unequal-mass binaries to obtain major improvements in the distance estimates, the latter is crucial for equal-mass cases. We show how the distribution of interferometers across the globe affects these measurements, and discuss this in terms of science drivers for 2.5- and third-generation gravitational-wave detectors.
J. Bustillo, T. Dietrich and P. Lasky
Tue, 23 Jun 20
73/84
Comments: 10 pages, 5 figures
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