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.