Broken scale invariance, massless dilaton and confinement in QCD

Dmitri Kharzeev*, Eugene Levin, Kirill Tuchin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Classical conformal invariance of QCD in the chiral limit is broken explicitly by scale anomaly. As a result, the lightest scalar particle (scalar glueball, or dilaton) in QCD is not light, and cannot be described as a Goldstone boson. Nevertheless basing on an effective low-energy theory of broken scale invariance we argue that inside the hadrons the non-perturbative interactions of gluon fields result in the emergence of a massless dilaton excitation (which we call the ''scalaron''). We demonstrate that our effective theory of broken scale invariance leads to confinement. This theory allows a dual formulation as a classical Yang-Mills theory on a curved conformal space-time background. Possible applications are discussed, including the description of strongly coupled quark-gluon plasma and the spin structure of hadrons.

Original languageEnglish
Article number055
JournalJournal of High Energy Physics
Issue number6
StatePublished - 2009


  • Confinement
  • QCD


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