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On the Stringy Hartle-Hawking State

arXiv:1512.01554 · doi:10.1007/JHEP03(2016)019

Abstract

We argue that non-perturbative $α'$ stringy effects render the Hartle-Hawking state associated with the $SL(2)/U(1)$ eternal black hole singular at the horizon. We discuss implications of this observation on firewalls in string theory.