Unified Treatment of Even and Odd Anharmonic Oscillators of Arbitrary Degree

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Jentschura, U. D.
Surzhykov, A.
Zinn-Justin, J.
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Abstract
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We present a unified treatment, including higher-order corrections, of anharmonic oscillators of arbitrary even and odd degree. Our approach is based on a dispersion relation which takes advantage of the PT-symmetry of odd potentials for imaginary coupling parameter, and of generalized quantization conditions which take into account instanton contributions. We find a number of explicit new results, including the general behaviour of large-order perturbation theory for arbitrary levels of odd anharmonic oscillators, and subleading corrections to the decay width of excited states for odd potentials, which are numerically significant.
Comment: 5 pages, RevTeX
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Mathematical Physics
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