Black holes have historically been thought to come in two flavors: between a few and tens of solar masses, formed in supernovae; and millions to billions of solar masses, grown in the centers of galaxies. However, several recent lines of evidence point to intermediate-mass black holes that exist in a number of dense stellar clusters. These black holes are expected to be found in binaries. As a result, three and four body interactions are common, in a realm including both Newtonian effects and general relativistic effects such as precession of the pericenter and orbital evolution due to gravitational radiation. These objects may therefore be a new source of gravitational waves with unique properties. We discuss the possibility of detecting this gravitational radiation with future instruments such as LISA and Advanced LIGO.
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