Accretion within the innermost stable circular orbit of Kerr black holes

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• Andrew Mummery (Oxford)
• Monday 06 February 2023, 14:00-15:00
• Streaming online and in MR14.

If you have a question about this talk, please contact Zhao Guo.

Abstract: Classical relativistic theories of accretion are artificially curtailed at the ISCO (innermost stable circular orbit) with all observable quantities set to zero between this radius and the black hole’s event horizon. Real accretion flows (as well as those in simulations) do not behave in this manner and remain hot and (potentially) observable until right up against the black hole’s event horizon. In this talk I will discuss a new theoretical approach which allows existing accretion theories to be extended through the ISCO . I will highlight a number of remarkable self-similar properties of these solutions, which show no explicit dependence on the black hole’s spin parameter. Finally, I will discuss how existing “viscous” theories exterior to the ISCO may need to be revisited to better model the turbulent nature of an accretion flow near to the ISCO .

This talk is part of the DAMTP Astrophysics Seminars series.

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