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SUMMARY:Achilleas Porfyriadis (U. Crete)
DTSTART:20241001T110000Z
DTEND:20241001T120000Z
DTSTAMP:20260423T024827Z
UID:NKUA-HEP/29
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/NKUA-HEP/29/
 ">Extreme Black Holes: Anabasis and Accidental Symmetry</a>\nby Achilleas 
 Porfyriadis (U. Crete) as part of NKUA HEP Seminars\n\n\nAbstract\nThe nea
 r-horizon region of black holes near extremality is universally AdS2-like.
  In this talk I will first explain the SL(2) transformation properties of 
 the spherically symmetric linear perturbations of AdS2 x S2 and show how t
 heir backreaction leads to the Reissner-Nordstrom black hole. This backrea
 ction with boundary condition change is called an anabasis. I will then sh
 ow that the linear Einstein equation near AdS2 x S2\, with or without addi
 tional matter\, enjoys an accidental symmetry that may be thought of as an
  on-shell large diffeomorphism of AdS2. These symmetries are able to map d
 ifferent physical solutions onto each other by acting as a linearized diff
 eomorphisms on perturbative solutions around AdS2.\n
LOCATION:https://researchseminars.org/talk/NKUA-HEP/29/
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