title: Nearest-neighbor distribution for singular billiards.
abstract: The exact computation of the nearest-neighbor spacing distribution P(s) is performed for a rectangular billiard with a pointlike scatterer inside for periodic and Dirichlet boundary conditions, and it is demonstrated that when s-->infinity this function decreases exponentially. Together with the results of Bogomolny, Gerland, and Schmit [Phys. Rev. E 63, 036206 (2001)], it proves that spectral statistics of such systems is of intermediate type characterized by level repulsion at small distances and exponential fall-off of the nearest-neighbor distribution at large distances. The calculation of the nth nearest-neighbor spacing distribution P(n)(s) and its asymptotics is performed as well for any boundary conditions.
authors.affiliation: Laboratoire de Physique Théorique et Modèles Statistiques, Université de Paris XI, Bâtiment 100, 91405 Orsay Cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Bogomolny
authors.forename: O
authors.initials: O
authors.lastname: Giraud
authors.forename: C
authors.initials: C
authors.lastname: Schmit