Holographic Weyl anomaly in string theory
Abstract
We compute the worldsheet sphere partition function of string theory on global AdS3 with pure NS-NS flux. Because of an unfixed M\"obius symmetry on the worldsheet, there is a cancellation of infinities and only a part of the answer is unambiguous. We show that it precisely reproduces the holographic Weyl anomaly and the ambiguous terms correspond to the possible counterterms of the boundary CFT.
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