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Peer-reviewedCC BYJournal of High Energy Physics

Bouncing off a stringy singularity

  • Matthew Dodelson1
  • Cristoforo Iossa2
  • Robin Karlsson3
  1. 1Harvard University
  2. 2Université de Genève
  3. 3University of Oxford
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Abstract

A bstract A sharp signature of the black hole singularity in holography is a divergence in the boundary thermal two-point function at a specific point in the complex time plane. This divergence arises from a null geodesic that bounces off the black hole singularity. At finite ’t Hooft coupling, stringy corrections to the bulk dynamics cannot be neglected, and the fate of the bouncing geodesic is an open question. We propose a simple scenario in which the singularity in the two-point function is shifted slightly into the complex plane, thereby smoothing it out into a finite-size bump. We demonstrate this smoothing explicitly in a microscopic example, namely the Sachdev-Ye-Kitaev model at infinite temperature, where the correlator is under analytic control. Our result suggests a bulk description of planar theories at finite coupling as stringy black holes.

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Cite

BibTeXRIS
BibTeX
@article{dodelson2026bouncing,
  title = {{Bouncing off a stringy singularity}},
  author = {Matthew Dodelson and Cristoforo Iossa and Robin Karlsson},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = jul,
  doi = {10.1007/jhep07(2026)161},
  url = {https://doi.org/10.1007/jhep07(2026)161},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Bouncing off a stringy singularity
AU  - Matthew Dodelson
AU  - Cristoforo Iossa
AU  - Robin Karlsson
PY  - 2026
DA  - 2026/07/17
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep07(2026)161
UR  - https://doi.org/10.1007/jhep07(2026)161
AB  - A bstract A sharp signature of the black hole singularity in holography is a divergence in the boundary thermal two-point function at a specific point in the complex time plane. This divergence arises from a null geodesic that bounces off the black hole singularity. At finite ’t Hooft coupling, stringy corrections to the bulk dynamics cannot be neglected, and the fate of the bouncing geodesic is an open question. We propose a simple scenario in which the singularity in the two-point function is shifted slightly into the complex plane, thereby smoothing it out into a finite-size bump. We demonstrate this smoothing explicitly in a microscopic example, namely the Sachdev-Ye-Kitaev model at infinite temperature, where the correlator is under analytic control. Our result suggests a bulk description of planar theories at finite coupling as stringy black holes.
SN  - 1029-8479
SN  - 1126-6708
SN  - 1127-2236
ER  -