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Dynamics of warped discs

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If you have a question about this talk, please contact Dr William B├ęthune.

Astrophysical discs are often warped, that is, their orbital planes change with radius. Discs can be warped by e.g. Lense-Thirring precession induced by a misaligned spinning black hole, or the gravitational pull of a misaligned companion. I will discuss the dynamics of warped discs, provide my thoughts on the role of `viscosity’ in their evolution, and present simulations of tilt oscillations, Kozai-Lidov oscillations and disc tearing. Finally I will present the results of a stability analysis of the warped disc equations to derive the criteria for the warp to be unstable and the disc to separate into distinct planes.

This talk is part of the DAMTP Astrophysics Seminar series.

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