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Tidal Dynamics in Kerr Spacetime

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arxiv gr-qc/0602071 v2 pith:6GLZNQBS submitted 2006-02-19 gr-qc astro-ph

Tidal Dynamics in Kerr Spacetime

classification gr-qc astro-ph
keywords kerrcirculardynamicsfreeorbitrelativespeedsqrt
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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/sqrt(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/sqrt(2). Possible applications of our results to high-energy astrophysics are briefly mentioned.

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