| {"keywords": ["gravitational", "astronomers", "spacecraft", "orbit", "relativistic", "orbital", "doppler", "spacetime", "f_observed", "effect", "ligo", "gravitational", "relativity", "spacetime", "amplitude", "waves", "universe", "wave", "cosmic", "virgo", "schwarzschild", "gravitational", "relativity", "accretion", "spacetime", "orbit", "redshift", "horizon", "curvature", "radius"], "topics": ["Detection and study of black holes", "Gravitational Waves: Detection and Properties", "Black Hole Mass and Properties"]} |