arXiv:nucl-th/9507018·v1·Nuclear Theory
Quantum Chaos, Degeneracies and Exceptional Points
W. Dieter Heiss🇿🇦 · Stefanel Radu (Centre for Nonlinear Studies, Department of Physics, University of the Witwatersrand, Johannesburg, South Africa)🇿🇦
Abstract
It is argued that, if a regular Hamiltonian is perturbed by a term that produces chaos, the onset of chaos is shifted towards larger values of the perturbation parameter if the unperturbed spectrum is degenerate and the lifting of the degeneracy is of second order in this parameter. The argument is based on the behaviour of the exceptional points of the full problem.
Comments: RevTeX with 4 figs. available from the authors; to appear in Phys.Rev.A