Large-N spacetime reduction and the sign and silver-blaze problems of dense QCD

Understand

We study the spacetime-reduced (Eguchi-Kawai) version of large-N QCD with nonzero chemical potential.

• We explore a method to suppress the sign fluctuations of the Dirac determinant in the hadronic phase; the method employs a re-summation of gauge configurations that are related to each other by center transformations.
• We numerically test this method in two dimensions, and find that it successfully solves the silver-blaze problem.
• We analyze the system further, and measure its free energy F, the average phase theta of its Dirac determinant, and its chiral condensate <psi-bar-psi>.