JHEP11(2019)014
Published for SISSA by Springer
Received: September 5, 2019
Revised: October 27, 2019
Accepted: October 27, 2019
Published: November 5, 2019
Stringy black hole interiors
Amit Giveon
a
and Nissan Itzhaki
b
a
Racah Institute of Physics, The Hebrew University,
Jerusalem 91904, Israel
b
Physics Department, Tel-Aviv University,
Ramat-Aviv, 69978, Israel
E-mail: giveon@mail.huji.ac.i, nitzhaki@post.tau.ac.il
Abstract: It is well known that non-perturbative α
0
corrections to the SL(2, R)/U(1) cigar
geometry are described via a condensation of a Sine-Liouville operator that schematically
can be written as W
+
+ W
−
, where W
±
describe a string with winding number ±1. This
condensation leads to interesting effects in the cigar geometry that take place already at the
classical level in string theory. Condensation of the analytically continued Sine-Liouville
operator in the Lorentzian SL(2, R)/U(1) black hole is problematic. Here, we propose that
in the black hole case, the non-perturbative α
0
corrections are described in terms of an
operator that can be viewed as the analytic continuation of the fusion of W
+
and W
−
.
We show that this operator does not suffer from the same problem as the analytically
continued Sine-Liouville operator and argue that it describes folded strings that fill the
entire black hole and, in a sense, replace the black hole interior. We estimate the folded
strings radiation, and show that they radiate at the Hawking temperature.
Keywords: 2D Gravity, Black Holes, Black Holes in String Theory
ArXiv ePrint: 1908.05000
Open Access,
c
The Authors.
Article funded by SCOAP
3
.
https://doi.org/10.1007/JHEP11(2019)014
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