A Space/Time Interchange Symmetry of Rotating AdS Black Holes in General Dimensions

TL;DR

This paper uncovers a generalized space/time interchange symmetry in rotating AdS black holes across all dimensions, revealing a deeper geometric relation involving time and angular coordinates.

Contribution

It extends a known symmetry from five dimensions to all dimensions, transforming a trivial angular symmetry into a nonlinearly realized space/time interchange symmetry.

Findings

Identifies a new symmetry relating over- and under-rotating black holes.

Generalizes the symmetry to all spacetime dimensions including four.

Reveals a nonlinear realization of a higher-order symmetry involving time.

Abstract

We revisit the previously known local inversion symmetry of the five-dimensional Kerr-AdS metric that relates the over-rotating black hole to the under-rotating one and reinterpret it as an interchanging symmetry between time and the longitudinal angular coordinates. We generalize this to all $D$ dimensions, including $D=4$, thereby enlarging the trivial linear $\mathbb Z_N$ symmetry of the $N=\lfloor(D-1)/2\rfloor$ longitudinal angular coordinates to the nonlinearly realized $\mathbb Z_{N+1}$ symmetry that involves time.