The critical points of strongly coupled lattice QCD at nonzero chemical potential
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Abstract
We study QCD at nonzero quark density, zero temperature, infinite coupling using the Glasgow algorithm. An improved complex zero analysis gives a critical point ${\ensuremath{\mu}}_{c}$ in agreement with that of chiral symmetry restoration computed with strong coupling expansions, and monomer-dimer simulations. We observe, however, two unphysical critical points: the onset for the number density ${\ensuremath{\mu}}_{0}$, and ${\ensuremath{\mu}}_{s}$ the saturation threshold, coincident with pathological onsets observed in past quenched QCD calculations. An analysis of the probability distributions for particle number supports our physical interpretation of the critical point ${\ensuremath{\mu}}_{c},$ and offers a new intepretation of ${\ensuremath{\mu}}_{0}$, which confirms its unphysical nature. The perspectives for future lattice QCD calculations of the properties of dense baryonic matter are briefly discussed.
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