Abstract

A measure of phase space delocalization for the eigenfunctions of regular and irregular eigenstates of a bound hamiltonian is introduced on the basis of a smoothed Wigner distribution function and a phase space graining. This measure, which is an entropy-like quantity, shows a large dispersion as a function of energy above and below the critical energy E C for classically chaotic motion. It is conjectured that many chaotic states also show properties of regular states too.

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