Year: 2026
Type: preprint
Abstract: Thermal two-point functions of holographic CFTs can probe the black hole singularity. When a bouncing geodesic exists, the correlator at leading order in $1/N$ develops a singularity $G(t, \vec{x}=0) \propto (t_c-t)^{-2Δ+b_t}$, where $Δ$ is the scaling dimension of the operator. We show that the additional exponent $b_t$ is determined by the Kasner exponents near the singularity. From the wave reflected off the singularity, which gives an exponentially small term in the large-frequency retarded correlator, we derive the formula $b_t=(d-1) \max \left( \frac{p_i-p_t}{1-p_t}, \frac{1}{2} \right)$ for planar black branes in AdS$_{d+1}$, where $p_t$ and $p_i$ are the Kasner exponents of the time and spatial directions. We compare our formula with the numerical values of Čeplak and Valach. It reproduces the relation that they proposed for a special class of black branes. For more general black branes, where no formula had been found, our formula agrees with most of their numerical data and fits them much better than the extension of their relation. We also give predictions for $b_t$ in theories where the Kasner exponents are known, but $b_t$ has not been computed.
Source: arXiv (Cornell University)
Author: Oh, Hyunwoo
Institution: Seoul National University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223706762