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The aLIGO detection of the black-hole binary GW150914 opened a new era forprobing extreme gravity. Many gravity theories predict the emission of dipolegravitational radiation by binaries. This is excluded to high accuracy inbinary pulsars, but entire classes of theories predict this effectpredominantly (or only) in binaries involving black holes. Joint observationsof GW150914-like systems by aLIGO and eLISA will improve bounds on dipoleemission from black-hole binaries by six orders of magnitude relative tocurrent constraints, provided that eLISA is not dramatically descoped.

Theory-Agnostic Constraints on Black-Hole Dipole Radiation with Multi-Band Gravitational-Wave Astrophysics