Pure gravitational wave estimation of Hubbles constant using neutron star-black hole mergers
Fung L.W.H. Broadhurst T. Smoot G.F.
1 April 2025Oxford University Press
Monthly Notices of the Royal Astronomical Society
2025#538Issue 2711 - 725 pp.
It has been predicted before the first detection of such events by LIGO (Laser Interferometer Gravitational-Wave Observatory) that the gravitational wave (GW) emission from compact binary coalescence can be used to constrain the expansion rate of the Universe. Here we show how can be derived purely from the GW of neutron star-black hole (NSBH) mergers using a Bayesian hierarchical inference framework. This method provides an estimate of spanning the redshift range -1 Mpc-1 for the likely NSBH events GW190426 and GW200115 using the proof-of-concept analysis outlined in this work. Taking into account of realistic detectors response and sensitivity, we forecast that soon, with 10 more such NSBH events, we can reach competitive precision of. It is valuable to have a completely independent, both in terms of observations and relevant physics, method of determining as is emphasized by the current controversy on and attempts to explain it by invoking new physics.
cosmological parameters , distance scale , gravitational waves , methods: observational
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Department of Physics and Jockey Club Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
Institute for Computational Cosmology & Centre for Extragalactic Astronomy, Durham University, Stockton Road, Durham, DH1 3LE, United Kingdom
Department of Theoretical Physics, University of the Basque Country UPV/EHU, Bilbao, E-48080, Spain
DIPC, Basque Country UPV/EHU, San Sebastian, E-48080, Spain
Ikerbasque, Basque Foundation for Science, Bilbao, E-48011, Spain
Energetic Cosmos Laboratory, Nazarbayev University, Qabanbay Batyr Ave 53, Astana, 010000, Kazakhstan
Paris Centre for Cosmological Physics, APC - AstroParticule et Cosmologie, Universit de Paris, CNRS/IN2P3 CEA/lrfu, 10 Rue Alice Domon et Leonie Duquet, Paris, F-75205 Cedex 13, France
Physics Department & LBNL, University of California at Berkeley, Berkeley, 94720, CA, United States
Department of Physics and Jockey Club Institute for Advanced Study
Institute for Computational Cosmology & Centre for Extragalactic Astronomy
Department of Theoretical Physics
DIPC
Ikerbasque
Energetic Cosmos Laboratory
Paris Centre for Cosmological Physics
Physics Department & LBNL
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