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Susskind and Uglum Revisited

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If you have a question about this talk, please contact Chiung Hwang.

In this talk, I will give a brief overview of Susskind’s and Uglum’s work with a special focus on their closed string off-shell derivation of the tree-level black hole entropy in a conical manifold.

Since conformal invariance is broken (due to the conical singularitiy), the nonlinear sigma model living on the worldsheet is a QFT rather than a CFT . Susskind and Uglum used Tseytlin’s nonlinear sigma model-based prescription for constructing off-shell classical effective actions. Their calculation gets the factor of 1/4 of the black hole entropy correct.

I will briefly mention some novel justifications for Tseytlin’s sphere prescriptions, in particular, how to use it to obtain (i) Witten’s i\varepsilon prescription for the Lorentzian S-matrix, and time permitting (ii) the correct equations of motion in Euclidean signature. This is based on work with Aron Wall.

This talk is part of the Quantum Fields and Strings Seminars series.

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