Journal ArticleDOI
Generalized Anharmonic Oscillator
Reads0
Chats0
TLDR
In this paper, the generalized anharmonic oscillator is defined by the Hamiltonian HN, which in the coordinate space representation is given by HN = −d2/dx2 + ¼x2 + g(½x2)N.Abstract:
The generalized anharmonic oscillator is defined by the Hamiltonian HN, which in the coordinate space representation is given by HN = −d2/dx2 + ¼x2 + g(½x2)N. The analytic properties of the energy levels of HN as functions of complex coupling g are derived and described. Zeroth‐order WKB techniques are used in the mathematical analysis. For all N, the results are qualitatively similar to those for the ordinary anharmonic oscillator in which N = 2 and, thus, the results are model independent for this wide class of models. The limiting case N → ∞ is solved exactly without using WKB techniques. The exact solution agrees with the WKB solution to zeroth order. This agreement is most impressive and testifies to the accuracy and utility of WKB methods.read more
Citations
More filters
Journal ArticleDOI
Coupling constant analyticity for the anharmonic oscillator
Barry Simon,A Dicke +1 more
TL;DR: In this article, the analytic properties of the singular perturbation theory for p2 + x2 + βx4 were studied, and it was shown rigorously that the singularities have ± 270° as asymptotic phase.
Journal ArticleDOI
Eigenvalues of λx2m anharmonic oscillators
TL;DR: In this paper, the ground state and excited energy levels of the generalized anharmonic oscillator defined by the Hamiltonian Hm = − d2/dx2+x2+ λx2m, m = 2,3, …, have been calculated using the Hill determinants.
Journal ArticleDOI
Quantum theory of anharmonic oscillators. II. Energy levels of oscillators with x2α anharmonicity
TL;DR: In this article, the energy levels of anharmonic oscillators characterized by the potentials (1/2) x2+λx2α with α=2,3, ⋅⋅ ⋆ and λ≳0.
Journal ArticleDOI
Perturbation theory in large order
TL;DR: In this article, a statistical procedure in a simple lambda phi/sup 4/ model for summing the set of all graphs as the number of vertices is presented. And the connection between the large-order behavior of perturbation theory in quantum electrodynamics and the value of..cap alpha.., the charge on the electron is discussed.
References
More filters
Book
A Course of Modern Analysis
TL;DR: The volume now gives a somewhat exhaustive account of the various ramifications of the subject, which are set out in an attractive manner and should become indispensable, not only as a textbook for advanced students, but as a work of reference to those whose aim is to extend the knowledge of analysis.
Journal ArticleDOI
Analytic Structure of Energy Levels in a Field-Theory Model
Carl M. Bender,Tai Tsun Wu +1 more
TL;DR: In this paper, the authors consider a model in which perturbation theory diverges and analytically continues the energy levels into the complex $\ensuremath{\lambda}$ plane.