PreprintCC BY 4.0arXiv
Stringy resolution of bouncing singularities
Abstract
We study the near-horizon geometry of near-extremal NS5 branes, which admits an exact worldsheet description in terms of the SL(2,ℝ)k/U(1) coset. In the supergravity limit, the analytically continued time-domain reflection amplitude exhibits a singularity associated with a null geodesic bouncing off the black-hole singularity, analogous to the bouncing singularities of boundary correlators in asymptotically AdS spacetimes. We show that finite-string-length effects render this amplitude an entire function of complex time, completely resolving the bouncing singularity. This resolution is nonperturbative in the inverse coset level: the singularity persists at every finite order in the expansion.
Related
- Bouncing off a stringy singularity
- Bouncing singularities in Schwarzschild: a geometric origin of the QNM convergence region
- Fate of Bouncing Singularities at Finite GN
- Bouncing geodesics, black hole singularities, and singularities of thermal correlators
- Bouncing singularities and thermal correlators on line defects
BibTeX
@misc{buric2026stringy,
title = {{Stringy resolution of bouncing singularities}},
author = {Ilija Burić and Ivan Gusev and Andrei Parnachev},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.12311},
eprint = {2610.12311},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.12311},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Stringy resolution of bouncing singularities
AU - Ilija Burić
AU - Ivan Gusev
AU - Andrei Parnachev
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2610.12311
UR - https://arxiv.org/abs/2610.12311
AB - We study the near-horizon geometry of near-extremal NS5 branes, which admits an exact worldsheet description in terms of the SL(2,ℝ)_k/U(1) coset. In the supergravity limit, the analytically continued time-domain reflection amplitude exhibits a singularity associated with a null geodesic bouncing off the black-hole singularity, analogous to the bouncing singularities of boundary correlators in asymptotically AdS spacetimes. We show that finite-string-length effects render this amplitude an entire function of complex time, completely resolving the bouncing singularity. This resolution is nonperturbative in the inverse coset level: the singularity persists at every finite order in the expansion.
ER -