SMuK 2021 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 4: Gravitational waves
GR 4.6: Vortrag
Dienstag, 31. August 2021, 18:15–18:30, H6
Dark Sirens to Resolve the Hubble-Lemaître Tension — •Ssohrab Borhanian1,2, Arnab Dhani2, Anuradha Gupta3, K.G. Arun4, and Bangalore Sathyaprakash2 — 1Friedrich-Schiller-Universität Jena, Jena, Germany — 2Institute for Gravitation and the Cosmos, State College, USA — 3University of Mississippi, Oxford, USA — 4Chennai Mathemartical Institute, Chennai, India
The planned sensitivity upgrades to the LIGO and Virgo facilities could uniquely identify host galaxies of dark sirens, compact binary coalescences without any electromagnetic counterparts, within a redshift of z = 0.1. This is aided by the higher-order spherical harmonic modes present in the gravitational-wave signal, which also improve distance estimation. In conjunction, sensitivity upgrades and higher modes will facilitate an accurate, independent measurement of the host galaxy's redshift in addition to the luminosity distance from the gravitational-wave observation to infer the Hubble-Lemaître constant to better than a few percent in five years. A possible Voyager upgrade or third-generation facilities would further solidify the role of dark sirens for precision cosmology in the future.