A Puncture in the Euclidean Black Hole 
TYPE  High Energy Physics Seminar 
Speaker:  Yoav Zigdon 
Affiliation:  BGU 
Organizer:  Yotam Soreq 
Date:  17.01.2022 
Time:  11:30  12:30 
Abstract:  We consider the backreaction of the winding zero mode on the cigar geometry. We focus on the case of the $SL(2,R)_k/U(1)$ cigar associated with e.g. the nearhorizon limit of k NS5 blackbranes. We solve the equations of motion numerically in the large k limit as a function of the amplitude of the winding mode at infinity. We find that there is a critical amplitude $A_c=\exp(\gamma/2)$ that admits a critical solution. In string theory, the exact CFT description of the $SL(2,R)_k/U(1)$ cigar, fixes completely the winding amplitude, $A_s$, at infinity. We find that in the large $k$ limit there is an exact agreement $A_c=A_s$. The critical solution is a cigar with a puncture at its tip; consequently, the black hole entropy is carried entirely by the winding condensate. We comment on the Lorentzian interpretation of the solution.
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Meeting ID: 949 3023 9701
