# Nutational resonances, transitional precession, and precession-averaged evolution in binary black-hole systems

5 May 2017Xinyu ZhaoMichael KesdenDavide Gerosa

In the post-Newtonian (PN) regime, the timescale on which the spins of binary black holes precess is much shorter than the radiation-reaction timescale on which the black holes inspiral to smaller separations. On the precession timescale, the angle between the total and orbital angular momenta oscillates with nutation period $\tau$, during which the orbital angular momentum precesses about the total angular momentum by an angle $\alpha$... (read more)

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