By precisely monitoring the “ticks” of Nature's most precise clocks (millisecond pulsars), scientists are trying to detect the “ripples in spacetime” (gravitational waves) produced by the inspirals of supermassive black holes in the centers of distant merging galaxies. Here, we describe a relatively simple demonstration that uses two metronomes and a microphone to illustrate several techniques used by pulsar astronomers to search for and detect gravitational waves. An adapted version of this demonstration could be used as an instructional laboratory investigation at the undergraduate level.
Lam, Michael T., Joseph D. Romano, Joey S. Key, Marc Normandin, and Jeffrey S. Hazboun. "An acoustical analogue of a galactic-scale gravitational-wave detector." American Journal of Physics 86, no. 10 (2018): 755-764.
American Journal of Physics