Level spacings of parametric chiral random matrices and two-color QCD with twisted boundary condition

Abstract

We evaluate level spacing and smallest eigenvalue distributions of chiral random matrix ensembles transiting from symplectic or orthogonal to unitary symmetry classes with a crossover parameter rho. As expected from the effective sigma model description, these results can be fitted perfectly to the fundamental or adjoint staggered Dirac spectrum of SU(2) quenched lattice gauge theory under the imaginary chemical potential (twisting) mu. The linear dependence of the parameter rho on mu determines the pion decay constant F as its proportionality constant.

10 pages in PTPTeX, 15 figures. (v2) Uses new data with antiperiodicity in temporal direction, statistical errors updated. (v3) Version to appear in Prog. Theor. Phys. 128 (2012). arXiv admin note: text overlap with arXiv:1208.3452

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