TY  - GEN
AV  - public
KW  - Dysons Brownsche Bewegung
KW  -  Gruppenintegrale
KW  -  Zufallsmatrixtheoriegroup integrals
KW  -  quantum chaos
KW  -  random matrix theory
KW  -  supersymmetry
Y1  - 2000///
TI  - Group integrals in chaotic quantum systems
A1  - Kohler, Heiner
N2  - We derive a recursion formula for a class of  group integrals both in ordinary space and in superspace. These group integrals represent the generalization of Bessel functions to  matrix and supermatrix spaces. Thereby we derive exact expressions  for the one and two--point eigenvalue correlator of a random matrix model.   The model consists of a sum of two random matrices. One of them is diagonal and  models the regular part. The other one is a Gaussian random matrix  (GOE or GSE) modelling the chaotic admixture. We prove that in ordinary space  the recursion formula is an integral solution of a Hamiltonian system related to Calogero--Sutherland models for arbitrary coupling beta>0. We calculate closed expressions for some group integrals over the unitary symplectic group. Moreover we generalize  the Gelfand--Tzetlin coordinate system and construct a parametrization  of the unitary orthosymplectic group UOSp(k_1/2k_2). 
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/1406/
ID  - heidok1406
ER  -