QCD at finite baryon density: nucleon droplets and color superconductivity

  title={QCD at finite baryon density: nucleon droplets and color superconductivity},
  author={Mark G. Alford and Krishna Rajagopal and Frank Wilczek},
  journal={Physics Letters B},
Abstract We use a variational procedure to study finite density QCD in an approximation in which the interaction between quarks is modelled by that induced by instantons. We find that uniform states with conventional chiral symmetry breaking have negative pressure with respect to empty space at all but the lowest densities, and are therefore unstable. This is a precisely defined phenomenon which motivates the basic picture of hadrons assumed in the MIT bag model, with nucleons as droplets of… Expand

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