Tidal dynamics in Kerr spacetime
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The motion of free nearby test particles relative to a stable equatorial circular geodesic orbit about a Kerr source is investigated. It is shown that the nonlinear generalized Jacobi equation can be transformed in this case to an autonomous form. Tidal dynamics beyond the critical speed c/√2 is studied. We show, in particular, that a free test particle vertically launched from the circular orbit parallel or antiparallel to the Kerr rotation axis is tidally accelerated if its initial relative speed exceeds c/√2. Possible applications of our results to high-energy astrophysics are briefly mentioned.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.