English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In AdS/CFT, the fine grained entropy of a boundary region is dual to the areaof an extremal surface X in the bulk. It has been proposed that the area of acertain 'causal surface' C - i.e. the 'causal holographic information' (CHI) -corresponds to some coarse-grained entropy in the boundary theory. We constructtwo kinds of counterexamples that rule out various possible duals, using (1)vacuum rigidity and (2) thermal quenches. This includes the 'one-point entropy'proposed by Kelly and Wall, and a large class of related procedures. Also, anycoarse-graining that fixes the geometry of the bulk 'causal wedge' bounded byC, fails to reproduce CHI. This is in sharp contrast to the holographicentanglement entropy, where the area of the extremal surface X measures thesame information that is found in the 'entanglement wedge' bounded by X.

No Simple Dual to the Causal Holographic Information?