Probing Pole Skipping through Scalar-Gauss-Bonnet coupling

TL;DR

This paper investigates how pole skipping phenomena in holography are affected by scalar-Gauss-Bonnet interactions, revealing that external sources influence diffusion but not chaos-related parameters.

Contribution

It introduces a novel analysis of pole skipping response to external sources in scalar-Gauss-Bonnet holography, focusing on diffusion and chaos parameters.

Findings

Lyapunov exponent and butterfly velocity remain unchanged under external sources.

Diffusion coefficient evolves non-trivially with external sources.

Pole skipping points are connected to chaos in holographic models.

Abstract

The holographic phenomena of pole skipping have been studied in the presence of scalar-Gauss-Bonnet interaction in the four-dimensional Anti-de Sitter-Schwarzchild black hole background. Pole skipping points are special points in phase space where the bulk linearised differential equations have multiple ingoing solutions. Those special points are claimed to be connected to chaos. In this paper, we initiated a novel study on understanding the response of those special points under the application of external sources. The source is identified with the holographic dual operator of the bulk scalar field with its non-normalizable solutions. We analyze in detail the dynamics of pole skipping points in both sound and shear channels, considering linear perturbation in bulk. In the perturbative regime, characteristic parameters for chaos, namely Lyapunov exponent and butterfly velocity, remain unchanged. However, the diffusion coefficient has evolved non-trivially under the external source.