Statistics of impedance, local density of states, and reflection in quantum chaotic systems with absorption

We are interested in finding the joint distribution function of the real and imaginary parts of the local Green's function for a system with chaotic internal wave scattering and a uniform energy loss (absorption). For a microwave cavity attached to a single-mode antenna, the same quantity has a meaning of the complex cavity impedance. Using the random matrix approach, we relate its statistics to that of the reflection coefficient and scattering phase and provide exact distributions for systems with the beta = 2 and beta = 4 symmetry class. In the case of beta = 1, we provide an interpolation formula that incorporates all the known limiting cases and excellently fits the available experimental data as well as diverse numeric tests. (C) 2004 MAIK Nauka/Interperiodica.