LAUSR

Several large-scale experimental facilities and space-missions are being suggested to probe the universe across the spectrum. Here we propose - the first concept design in the NASA Artemis era for a GW observatory on the Moon. Using feasible interferometer technologies, we find that a lunar-based observatory is ideal for probing frequencies in the range between deci-Hz to 5 Hz, an astrophysically rich regime that is very challenging for both Earth- and space-based detectors. GLOC can survey binaries with neutron stars, stellar and intermediate-mass black holes to ≳ 70% of the observable volume of our universe without significant background contamination. The sensitivity at ????(1 Hz) allows a unique window into calibrating Type Ia supernovae. At its ultimate sensitivity limits, GLOC would trace the Hubble expansion rate up to redshift z ∼ 3 and test General Relativity and ΛCDM cosmology up to z∼ 350.