  A preliminary discussion is given of the prospects that gravitational-wave
observations of binary inspiral of black holes could reveal or constrain
quantum modifications to black hole dynamics, such as are required to preserve
postulates of quantum mechanics. Different proposals for such modifications are
characterized by different scales, and the size of these scales relative to
those probed by observation of inspiral signals is important in determining the
feasibility of finding experimental signatures. Certain scenarios with strong
quantum modifications in a region extending well outside the horizon are
expected to modify classical evolution, and distort the near-peak gravitational
wave signal, suggesting a search for departures from waveforms predicted by
general relativity. The near agreement of the GW150914 signal with such
waveforms is discussed, and indicates constraints on some such scenarios.
Important strategies for more precise future tests are 1) to develop more
precise predictions from scenarios proposing quantum modifications, and 2)
searching for observed deviations from numerical relativity predictions via
analysis of gravity wave data, particularly focussing on the signal region
corresponding to plunge and merger.
