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SUMMARY:Yixuan Li (Munich\, Max Planck Inst.)
DTSTART:20230308T150000Z
DTEND:20230308T160000Z
DTSTAMP:20260423T021123Z
UID:AnLy/22
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/AnLy/22/">Lo
 cal supersymmetry enhancement and the entropy of three-charge black holes<
 /a>\nby Yixuan Li (Munich\, Max Planck Inst.) as part of AnLy Strings and 
 Fields online seminars\n\n\nAbstract\nIn string theory\, black holes can b
 e realised as bound states of branes and strings. The branes and the strin
 gs preserve a set of global supersymmetries\, which imposes the geometry o
 f the near-horizon region. However\, there exists a whole moduli space of 
 brane systems that preserve those same global supersymmetries\, but whose 
 number of local supersymmetries is enhanced. Such brane configuration shou
 ld describe some microstates of the black hole\; but how much of the black
 -hole entropy can these configurations account for? \n\nIn this talk\, I w
 ill first present this formalism based on local supersymmetries that ident
 ifies the ingredients needed to describe the microstates of a supersymmetr
 ic black hole.\nThen\, I will illustrate the local supersymmetry enhanceme
 nt mechanism with the three-charge F1-NS5-P black hole in Type IIA. The bl
 ack-hole entropy is accounted by the fractionation\, due to the presence o
 f the five-branes\, of the fundamental strings into many ‘little strings
 ’ which act as independent momentum carriers.\nI will apply the supersym
 metric enhancement mechanism to these brane systems\, and show it gives ri
 se to a new class of black-hole microstate solutions which preserve the ro
 tational symmetry of the black-hole horizon. Finally\, I will explain why 
 one could expect their supergravity description to be horizonless in the M
 -theory frame\, and how our results point towards a change of strategy in 
 the fuzzball programme in the endeavour of constructing horizonless black-
 hole microstates.\n
LOCATION:https://researchseminars.org/talk/AnLy/22/
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