A sticky business: The status of the conjectured viscosity/entropy density bound

Aleksey Cherman, Thomas D. Cohen, Paul M. Hohler

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

There have been a number of forms of a conjecture that there is a universal lower bound on the ratio, η/s, of the shear viscosity, η, to entropy density, s, with several different domains of validity. We examine the various forms of the conjecture. We argue that a number of variants of the conjecture are not viable due to the existence of theoretically consistent counterexamples. We also note that much of the evidence in favor of a bound does not apply to the variants which have not yet been ruled out.

Original languageEnglish (US)
Article number026
JournalJournal of High Energy Physics
Volume2008
Issue number2
DOIs
StatePublished - Feb 1 2008
Externally publishedYes

Keywords

  • 1/N expansion
  • AdS-CFT correspondence
  • QCD

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