Measuring the Hubble Constant with General Relativity
A 2 per cent Hubble constant measurement from standard sirens within 5 years
Gravitational wave coalescence events provide an entirely new way todetermine the hubble constant, with the absolute distance calibration providedby the theory of general relativity.This standard siren method was utilized to measure the value of the constant using the binary neutron-star merger gw170817, as well as optical identifications of the host galaxy, ngc 4993. local distance ladder observations may achieve a precision of within 5 years, but at present there are no indications that further observations will substantially reduce the existing discrepancies.Here we show that ligo and virgo can be expected to constrain the value of the constant to a precision of within 5 years and within a decade.
