2021/08/31 by Wyatt Reeves, Moshe Rozali, Petar Simidzija +3 · 1 citation
Physics and Astronomy · #hep-th
paper · pdf · doi:10.1007/jhep12(2021)002
Minor edits to v1 (comments and citations added in footnotes); acknowledgments added
arxiv created 2021/11/08 · arxiv updated 2021/12/22
When does a holographic CFT with a boundary added to it (a BCFT) also have a `good' holographic dual with a localized gravitating end-of-the-world brane? We argue that the answer to this question is almost never. By studying Lorentzian BCFT correlators, we characterize constraints imposed on a BCFT by the existence of a bulk causal structure. We argue that approximate `bulk brane' singularities place restrictive constraints on the spectrum of a BCFT that are not expected to be true generically. We discuss how similar constraints implied by bulk causality might apply in higher-dimensional holographic descriptions of BCFTs involving a degenerating internal space. We suggest (although do not prove) that even these higher-dimensional holographic duals are not generic.