Spectral function and quark diffusion constant in non-critical holographic QCD

Yan Yan Bu, Jin Min Yang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Motivated by recent studies of intersecting D-brane systems in critical string theory and phenomenological AdS/QCD models, we present a detailed analysis for the vector and scalar fluctuations in a non-critical holographic QCD model in the high temperature phase, i.e., the chiral symmetric phase. This model is described by Nf pairs of D4 and D4̄ probe branes in a non-critical AdS6 black hole background. Focusing on the hydrodynamic as well as the high frequency limit, we analytically obtain spectral functions for vector and scalar modes on the flavor probe. Then we extract the light quark diffusion constant for flavor current using three different methods and find that different methods give the same results. We also compute the heavy quark diffusion constant for comparison with the light quark case.

Original languageEnglish
Pages (from-to)388-419
Number of pages32
JournalNuclear Physics B
Issue number2
StatePublished - 11 Feb 2012
Externally publishedYes


  • Gauge-gravity correspondence
  • Holographic dual of QCD
  • Thermal field theory

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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