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We present a novel test of general relativity (GR): measuring the geometriccomponent of the time delay due to gravitational lensing. GR predicts thatphotons and gravitational waves follow the same geodesic paths and thusexperience the same geometric time delay. We show that for typical systems, thetime delays are tens of seconds, and thus can dominate over astrophysicaldelays in the timing of photon emission. For the case of GW 170817, we use amulti-plane lensing code to evaluate the time delay due to four massive halosalong the line of sight. From literature mass and distance measurements ofthese halos, we establish at high confidence (significantly greater than 5sigma) that the gravitational waves of GW 170817 underwent gravitationaldeflection to arrive within 1.7 seconds of the photons.

Does Gravity Fall Down? Evidence for Gravitational Wave Deflection Along the Line of Sight to GW 170817