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Testing deviation of GR is one of the main goals of the proposed {\emph{LaserInterferometer Space Antenna}}, a space-based gravitational-wave observatory.For the first time, we consistently compute the generation of gravitationalwaves from extreme-mass ratio inspirals (stellar compact objects intosupermassive black holes) in a well-motivated alternative theory of gravity,that to date remains weakly constrained by double binary pulsar observations.The theory we concentrate on is Chern-Simons (CS) modified gravity, a 4-D,effective theory that is motivated both from string theory and loop-quantumgravity, and which enhances the Einstein-Hilbert action through the addition ofa dynamical scalar field and the parity-violating Pontryagin density. We showthat although point particles continue to follow geodesics in the modifiedtheory, the background about which they inspiral is a modification to the Kerrmetric, which imprints a CS correction on the gravitational waves emitted. CSmodified gravitational waves are sufficiently different from the GeneralRelativistic expectation that they lead to significant dephasing after 3 weeksof evolution, but such dephasing will probably not prevent detection of thesesignals, but instead lead to a systematic error in the determination ofparameters. We end with a study of radiation-reaction in the modified theoryand show that, to leading-order, energy-momentum emission is not CS modified,except possibly for the subdominant effect of scalar-field emission. Theinclusion of radiation-reaction will allow for tests of CS modified gravitywith space-borne detectors that might be two orders of magnitude larger thancurrent binary pulsar bounds.

Testing Effective Quantum Gravity with Gravitational Waves from Extreme-Mass-Ratio Inspirals