title: Wigner-Dyson statistics from the Keldysh sigma-model.
abstract: The level statistics of disordered metallic grains with broken time reversal invariance is obtained from the Keldysh nonlinear sigma-model. The basic strategy of the approach--a nonperturbative integration over all saddle points of the sigma-model manifold--might prove useful in the analysis of problems involving disorder and interactions.
authors.affiliation: Theoretische Physik III, Ruhr-Universität Bochum, 44780, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Altland
authors.forename: A
authors.initials: A
authors.lastname: Kamenev