Boundary Rigidity and Holography

Abstract

We review boundary rigidity theorems assessing that, under appropriate conditions, Riemannian manifolds with the same spectrum of boundary geodesics are isometric. We show how to apply these theorems to the problem of reconstructing a $d+1$ dimensional, negative curvature space-time from boundary data associated to two-point functions of high-dimension local operators in a conformal field theory. We also show simple, physically relevant examples of negative-curvature spaces that fail to satisfy in a subtle way some of the assumptions of rigidity theorems. In those examples, we explicitly show that the spectrum of boundary geodesics is not sufficient to reconstruct the metric in the bulk. We also survey other reconstruction procedures and comment on their possible implementation in the context of the holographic AdS/CFT duality.

26 pages, 4 figures

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• Towards Bulk Metric Reconstruction from Extremal Area Variations
• Extracting the bulk metric from boundary information in asymptotically AdS spacetimes
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• A Conformally Invariant Holographic Two-Point Function on the Berger Sphere
• Machine Learning Statistical Gravity from Multi-Region Entanglement Entropy
• Building Bulk Geometry from the Tensor Radon Transform
• Entanglement renormalization and integral geometry
• Einstein black holes, free scalars and AdS/CFT correspondence
• Subregion duality, wedge classification and no global symmetries in AdS/CFT
• A proof of Lens Rigidity in the category of Analytic Metrics
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