The paper expresses the bulk and shear viscosities of cold dense nucleon matter through derivatives of the thermodynamic potential, and claims that the positivity of bulk viscosity imposes an independent stability condition on scalar-vector mean-field models.
Complex Langevin dynamics and other approaches at finite chemical potential
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abstract
I review the presence of the sign problem in lattice QCD at nonzero baryon density and its relation with the overlap and Silver Blaze problems. I then discuss progress in some cases where the sign problem can be handled, either because the sign problem is absent or because it is milder than in full QCD. Some time is spent on effective three-dimensional models, which can be treated with a variety of methods. I conclude with a discussion of the applicability of complex Langevin dynamics at nonzero density.
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Transport coefficients of dense nucleon matter at low temperature
The paper expresses the bulk and shear viscosities of cold dense nucleon matter through derivatives of the thermodynamic potential, and claims that the positivity of bulk viscosity imposes an independent stability condition on scalar-vector mean-field models.