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Gravitational waves from neutron star mergers have long been considered apromising way to measure the Hubble constant, $H_0$, which describes the localexpansion rate of the universe. While black hole mergers are more abundantlyobserved, their expected lack of electromagnetic emission and poorgravitational-wave localization make them less well suited for measuring $H_0$.Black hole mergers within the disks of Active Galactic Nuclei (AGN) could be anexception. Accretion from the AGN disk may produce an electromagnetic signal,pointing observers to the host galaxy. Alternatively, the low number density ofAGNs could help identify the host galaxy of $1-5\%$ of mergers. Here we showthat black hole mergers in AGN disks may be a sensitive way to determine $H_0$with gravitational waves. If $1\%$ ($10\%$) of LIGO's observations occur in AGNdisks with identified host galaxies, we could measure $H_0$ with $12\%$ ($4\%$)uncertainty in five years, possibly comparable to the sensitivity of neutronstar mergers and set to considerably improve current gravitational wavemeasurements.

Determining the Hubble Constant with AGN-assisted Black Hole Mergers