As Pechukas discovered [1], the fate of the eigenvalues and eigenvectors of a Hamiltonian H = H 0 +λV upon variation of λ can be described by a set of ordinary firstorder differential equations. That set was interpreted by Yukawa [2, 3] as Hamilton’s equations for fictitious classical particles moving in one dimension as the “time” λ elapses.
CITATION STYLE
Haake, F. (2001). Level Dynamics (pp. 141–219). https://doi.org/10.1007/978-3-662-04506-0_6
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