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The Onset of Chaos in the Quantum Hard-Sphere Gas

Mark Srednicki
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Abstract

We show that the condition for the appearance of quantum chaos (Wigner-Dyson distribution of energy eigenvalues, gaussian-random energy eigenfunctions) in a dilute gas of many hard spheres is $λ\ll \ell$, where $λ$ is the wavelength of a typical particle and $\ell$ is the mean free path between collisions. For fermions with Fermi wavelength $λ_F \ll \ell$, this implies that all energy eigenstates, including the ground state, are chaotic. Physical implications are discussed.

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Mark Srednicki. 1996-05-20. The Onset of Chaos in the Quantum Hard-Sphere Gas. https://arxiv.org/abs/cond-mat/9605127

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