A generalized plasma and interpolation between classical random matrix ensembles
Abstract
The eigenvalue probability density functions of the classical random matrix ensembles have a well known analogy with the one component log-gas at the special couplings β = 1,2 and 4. It has been known for some time that there is an exactly solvable two-component log-potential plasma which interpolates between the β =1 and 4 circular ensemble, and an exactly solvable two-component generalized plasma which interpolates between β = 2 and 4 circular ensemble. We extend known exact results relating to the latter --- for the free energy and one and two-point correlations --- by giving the general (k1+k2)-point correlation function in a Pfaffian form. Crucial to our working is an identity which expresses the Vandermonde determinant in terms of a Pfaffian. The exact evaluation of the general correlation is used to exhibit a perfect screening sum rule.