Pole-skipping and zero temperature

TL;DR

This paper investigates the pole-skipping phenomenon of scalar Green's functions in rotating BTZ black holes, revealing how left and right temperatures influence pole-skipping points, especially in extreme limits.

Contribution

It extends the understanding of pole-skipping to rotating backgrounds with independent left and right temperatures, identifying conditions where pole-skipping persists at extreme limits.

Findings

Pole-skipping points depend on both left and right temperatures.

In the extreme limit, pole-skipping generally does not occur.

A special case exists where pole-skipping occurs at right Matsubara frequencies even in the extreme limit.

Abstract

We study the pole-skipping phenomenon of the scalar retarded Green's function in the rotating BTZ black hole background. In the static case, the pole-skipping points are typically located at negative imaginary Matsubara frequencies $\omega=-(2\pi T)ni$ with appropriate values of complex wave number $q$. But, in a $(1+1)$-dimensional CFT, one can introduce temperatures for left-moving and right-moving sectors independently. As a result, the pole-skipping points $\omega$ depend both on left and right temperatures in the rotating background. In the extreme limit, the pole-skipping does not occur in general. But in a special case, the pole-skipping does occur even in the extreme limit, and the pole-skipping points are given by right Matsubara frequencies.