Conformal Symmetry of a Black Hole as a Scaling Limit: A Black Hole in an Asymptotically Conical Box

TL;DR

This paper demonstrates that certain black hole geometries with conformal symmetry can be derived as scaling limits of asymptotically flat black holes, revealing their structure as Kaluza-Klein quotients of AdS spaces and describing them as black holes in asymptotically conical boxes.

Contribution

It introduces a method to obtain subtracted geometries with conformal symmetry from original black holes via scaling limits and Harrison transformations, linking them to AdS/CFT structures.

Findings

Subtracted geometries exhibit $SL(2, ) imes SL(2, ) imes SO(3)$ symmetry.

Subtracted metrics are asymptotically conical, like global monopoles.

These geometries are Kaluza-Klein quotients of $AdS_3 imes 4 S^3$.

Abstract

We show that the previously obtained subtracted geometry of four-dimensional asymptotically flat multi-charged rotating black holes, whose massless wave equation exhibit $SL(2,\R) \times SL(2,\R) \times SO(3)$ symmetry may be obtained by a suitable scaling limit of certain asymptotically flat multi-charged rotating black holes, which is reminiscent of near-extreme black holes in the dilute gas approximation. The co-homogeneity-two geometry is supported by a dilation field and two (electric) gauge-field strengths. We also point out that these subtracted geometries can be obtained as a particular Harrison transformation of the original black holes. Furthermore the subtracted metrics are asymptotically conical (AC), like global monopoles, thus describing "a black hole in an AC box". Finally we account for the the emergence of the $SL(2,\R) \times SL(2,\R) \times SO(3)$ symmetry as a consequence of the subtracted metrics being Kaluza-Klein type quotients of $ AdS_3\times 4 S^3$. We demonstrate that similar properties hold for five-dimensional black holes.