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arXiv · hep-ph/9806479

Chiral Disorder and QCD at Finite Chemical Potential

Romuald A. Janik·Maciej A. Nowak·Gabor Papp·Ismail Zahed
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Abstract

We investigate the effects of a finite chemical potential $μ$ in QCD viewed as a disordered medium. In the quenched approximation, $A_4=iμ$ induces a complex electric Aharonov-Bohm effect that causes the diagonal contribution to the quark return probability to vanish at $μ=m_π/2$ (half the pion mass). In two-color QCD, the weak-localization contribution to the quark return probability remains unaffected causing a mutation in the spectral statistics. In full QCD, the complex electric flux is screened and the light quarks are shown to diffuse asymmetrically with a substantial decrease in the conductivity along the `spatial' directions. Mean-field arguments suggest that a d=1 percolation transition may take place in the range $1.5ρ_0<ρ<3ρ_0$, where $ρ_0$ is nuclear matter density.

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Romuald A. Janik, Maciej A. Nowak, Gabor Papp, Ismail Zahed. 1998-06-25. Chiral Disorder and QCD at Finite Chemical Potential. https://doi.org/10.1016/s0370-2693(98)01069-7

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