  Binary systems of two compact objects circularize and spiral toward each
other via the emission of gravitational waves. The coupling of the spins of
each object with the orbital angular momentum causes the orbital plane to
precess, which leads to modulation of the gravitational wave signal. Until now,
generating frequency-domain waveforms for fully precessing systems for use in
gravitational wave data analysis meant numerically integrating the equations of
motion, then Fourier transforming the result, which is very computationally
intensive for systems that complete hundreds or thousands of cycles in the
sensitive band of a detector. Previously, analytic solutions were only
available for certain special cases or for simplified models. Here we describe
the construction of closed-form, frequency-domain waveforms for
fully-precessing, quasi-circular binary inspirals.
