On volumes of subregions in holography and complexity

Omer Ben-Ami, Dean Carmi

Research output: Contribution to journalArticlepeer-review


The volume of the region inside the bulk Ryu-Takayanagi surface is a codimension-one object, and a natural generalization of holographic complexity to the case of subregions in the boundary QFT. We focus on time-independent geometries, and study the properties of this volume in various circumstances. We derive a formula for computing the volume for a strip entangling surface and a general asymptotically AdS bulk geometry. For an AdS black hole geometry, the volume exhibits non-monotonic behaviour as a function of the size of the entangling region (unlike the behaviour of the entanglement entropy in this setup, which is monotonic). For setups in which the holographic entanglement entropy exhibits transitions in the bulk, such as global AdS black hole, geometries dual to confining theories and disjoint entangling surfaces, the corresponding volume exhibits a discontinuous finite jump at the transition point (and so do the volumes of the corresponding entanglement wedges). We compute this volume discontinuity in several examples. Lastly, we compute the codim-zero volume and the bulk action of the entanglement wedge for the case of a sphere entangling surface and pure AdS geometry.

Original languageEnglish
Article number129
JournalJournal of High Energy Physics
Issue number11
StatePublished - 1 Nov 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016, The Author(s).


  • AdS-CFT Correspondence
  • Conformal Field Theory

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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