Holographic Reconstruction of Bubbles

TL;DR

This paper investigates holographic methods for reconstructing static bubble walls in BTZ black hole spacetimes, revealing limitations of existing approaches and identifying shadow regions caused by matter in the bulk.

Contribution

It compares two holographic reconstruction prescriptions in the context of bubble spacetimes and highlights the inadequacy of hole-ography for such scenarios.

Findings

Light-cone cuts method remains applicable within its limits.

Hole-ography approaches are insufficient for complete bubble spacetime reconstruction.

Bubble spacetimes feature shadow regions partially probed by geodesics.

Abstract

We discuss the holographic reconstruction of static thin bubble walls in BTZ black hole geometries. We consider two reconstruction prescriptions suggested in recent years: hole-ography and light-cone cuts, in the context of thin bubble walls, and comment on their applicability in the presence of non-trivial matter in the bulk. We find that while the light-cone cuts prescription goes through within its own limitations, the current hole-ographic approaches are inadequate to describe bubble spacetimes completely. Much like entanglement shadows found around BTZ black holes and conical defects in the bulk, we find that thin bubbles are accompanied by shadows of their own, which are regions of spacetime which are only partially probed by minimal geodesics. We speculate that such shadows might be a generic feature of the presence of matter in the bulk.