Fluctuation of correlation dimension and inverse participation number at the Anderson transition

The distribution of the correlation dimension in a power law band random matrix model having critical, i.e., multifractal, eigenstates is numerically investigated. It is shown that their probability distribution function has a fixed point as the system size is varied exactly at a value obtained from the scaling properties of the typical value of the inverse participation number. Therefore the state-to-state fluctuation of the correlation dimension is tightly linked to the scaling properties of the joint probability distribution of the eigenstates.