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SUMMARY:Symmetries and topology of extremal horizons - Alex Colling\, DAMT
 P
DTSTART:20250307T130000Z
DTEND:20250307T140000Z
UID:TALK228766@talks.cam.ac.uk
CONTACT:Daniela Cors
DESCRIPTION:We establish an intrinsic rigidity theorem for extremal horizo
 ns\, showing that a compact cross-section of a rotating extremal horizon m
 ust admit a Killing vector field. This result holds for a wide class of ma
 tter theories\, extending work by Dunajski and Lucietti in the vacuum case
 . In four-dimensional Einstein-Maxwell theory\, it follows that any non-tr
 ivial cross-section must be given by the extremal Kerr-Newman family. We a
 lso discuss the implications for the near-horizon geometry and the topolog
 y of cross-sections. This talk is partly based on joint work with David Ka
 tona and James Lucietti.
LOCATION:Potter room / https://cam-ac-uk.zoom.us/j/87235967698
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