Exact Eigenfunctions of a Chaotic System

The interest in the properties of quantum systems, whose classical dynamics are chaotic, derives from their abundance in nature. The spectrum of such systems can be related, in the semiclassical approximation, to the unstable classical periodic orbits, through Gutzwiller’s trace formula. The class of systems studied in this work, tiling billiards on the pseudo-sphere, is special in this correspondence being exact, via Selberg’s trace formula. In this work, an exact expression for Green’s function and the eigenfunctions of tiling billiards on the pseudo-sphere, whose classical dynamics are chaotic, is derived. Green’s function is shown to be equal to the quotient of two infinite sums over periodic orbits, where the denominator is the spectral determinant. Such a result is known to be true for typical chaotic systems, in the leading semiclassical approximation. From the exact expression for Green’s function, individual eigenfunctions can be identified. In order to obtain a semiclassical approximation by finite series for the infinite sums encountered, resummation by analytic continuation in h̄ was performed. The result, a semiclassical approximation, is similar to known results for eigenfunctions of typical chaotic systems. The lowest eigenfunctions of the Hamiltonian were calculated with the help of the resulting formulae, and compared with exact numerical results. A search for scars with the help of analytical and numerical methods failed to find evidence for their existence. PACS: 05.45.+b, 03.65.Sq