Random cyclic matrices

Abstract: We present a Gaussian ensemble of random cyclic matrices on the real field and study their spectral fluctuations. These cyclic matrices are shown to be pseudo-symmetric with respect to generalized parity. We calculate the joint probability distribution function of eigenvalues and the spacing distributions analytically and numerically. For small spacings, the level spacing distribution exhibits either a Gaussian or a linear form. Furthermore, for the general case of two arbitrary complex eigenvalues, leaving out the spacings among real eigenvalues, and, among complex conjugate pairs, we find that the spacing distribution agrees completely with the Wigner distribution for Poisson process on a plane. The cyclic matrices occur in a wide variety of physical situations, including disordered linear atomic chains and Ising model in two dimensions. These exact results are also relevant to two-dimensional statistical mechanics and $\nu$-parametrized quantum chromodynamics.