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Ramp and plateau in bulk correlators within the disk topology in Jackiw-Teitelboim gravity

Cristiano Germani* and Mickael Komendyak†

  • Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain

  • *Contact author: germani@icc.ub.edu
  • †Contact author: komendyak@icc.ub.edu
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Phys. Rev. D 113, 126016 – Published 10 June, 2026

DOI: https://doi.org/10.1103/37dn-cdf1

Abstract

We study bulk two-point correlation functions of a massless scalar field in Jackiw-Teitelboim gravity around the eternal black hole saddle. While same-side correlators exhibit exponential decay, two-sided correlators, at the next-to-leading order in steepest-descent approximation, exhibit a ramp followed by a plateau after the initial semiclassical exponential decay. Our results indicate that the late-time saturation of two-sided correlators is already visible within the perturbative saddle expansion of the bulk path integral, without invoking nonperturbative e−S effects. Finally, we show that the dip time, defined as the minimum of the correlator, grows inversely with the black hole temperature, consistent with expectations from the holographic dual.

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Phys. Rev. D 113, 126016– Published 10 June, 2026
  • Received 18 March 2026
  • Accepted 11 May 2026
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