John Swain at Boston University suggests we can translate the simple idea of Faraday’s electrical transformer into the gravitational domain. A beam of particles traveling in a circle would generate a “magnetogravitic flux” that can be picked up by a secondary winding, essentially a giant loop antenna.

It’s possible that the orbit of matter close to a black hole might provide the right kind of mass-energy currents.  He suggests that his idea could be tested by looking for “gravitational synchrotron radiation” in the Large Hadron Collilder that could be picked up by sensitive interferometers or Weber-type resonant bars.

Ref: arxiv.org/abs/1006.5754: Gravitatomagnetic Analogs of Electric Transformers