Modular Berry transport is a useful way to understand how geometric bulk information is encoded in the boundary CFT: the modular curvature is directly related to the bulk Riemann curvature. We extend this approach by studying modular transport in the presence of a non-trivial quantum extremal surface. Focusing on JT gravity on an AdS background coupled to a non-gravitating bath, we compute the modular curvature of an interval in the bath in the presence of an island: the Quantum Extremal Modular Curvature (QEMC). We highlight some important properties of the QEMC, most importantly that it is non-local in general. In an OPE limit, the QEMC becomes local and probes the bulk Riemann curvature in regions with an island. Our work gives a new approach to probe physics behind horizons.
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On invariants of modular categories beyond modular data
- Award ID(s):
- 1664359
- PAR ID:
- 10158907
- Date Published:
- Journal Name:
- Journal of Pure and Applied Algebra
- Volume:
- 223
- Issue:
- 9
- ISSN:
- 0022-4049
- Page Range / eLocation ID:
- 4065 to 4088
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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