Starts 29 Nov 2022 16:00

Ends 29 Nov 2022 17:30

Central European Time

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HECAP Seminar: Off-shell Strings and Black Hole Entropy

Starts 29 Nov 2022 16:00

Ends 29 Nov 2022 17:30

Central European Time

Zoom Meeting

I will also compare these off-shell results with the much more popular orbifold method for calculating entropy from the on-shell C/Z_N background. By considering processes involving twisted string states (basically the orbifold conserves twist and hence does not allow twisted strings to pinch off at the tip, while the off-shell NLSM of a slightly smoothed out cone obviously does allow this process), I will conclude that the orbifold backgrounds are fundamentally different from conical backgrounds at the same value of inverse temperature \beta---unless one allows tachyons to condense on the orbifold -- signalling that the analytically continued orbifold is a fundamentally non-geometrical construction. Thus, it is implausible that the orbifold background can be interpreted as the thermal partition function of any unitary statistical mechanical system at inverse temperature \beta.

Time permitting, I will end with some important insights into the ER=EPR hypothesis that can be obtained from the fact that the tachyon condensate (in orbifold backgrounds) at a codimension-2 surface is apparently equivalent to ordinary flat space. I will discuss prospects for deriving the holographic entanglement entropy (the RT formula) using the orbifold method.