Information flows in strongly coupled ABJM theory

Vijay Balasubramanian, Niko Jokela, Arttu Ponni, Alfonso V. Ramallo

Research output: Contribution to journalArticleScientificpeer-review


We use holographic methods to characterize the RG flow of quantum information in a Chern-Simons theory coupled to massive fermions. First, we use entanglement entropy and mutual information between strips to derive the dimension of the RG-driving operator and a monotonic c-function. We then display a scaling regime where, unlike in a CFT, the mutual information between strips changes non-monotonically with strip width, vanishing in both IR and UV but rising to a maximum at intermediate scales. The associated information transitions also contribute to non-monotonicity in the conditional mutual information which characterizes the independence of neighboring strips after conditioning on a third. Finally, we construct a measure of extensivity which tests to what extent information that region A shares with regions B and C is additive. In general, mutual information is super-extensive in holographic theories, and we might expect super-extensivity to be maximized in CFTs since they are scale-free. Surprisingly, our massive theory is more super-extensive than a CFT in a range of scales near the UV limit, although it is less super-extensive than a CFT at all lower scales. Our analysis requires the full ten-dimensional dual gravity background, and the extremal surfaces computing entanglement entropy explore all of these dimensions.
Original languageEnglish
Article number232
JournalJournal of High Energy Physics
Issue number1
Number of pages38
Publication statusPublished - 31 Jan 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • AdS-CFT Correspondence
  • D-branes
  • 114 Physical sciences

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