Spectral asymptotics for the third order operator with periodic coefficients

Details Spectral asymptotics for the third order operator with periodic coefficients Spectral asymptotics for the third order operator with periodic coefficients

2011-12-21

arxiv.org/abs/1112.4973v1

Physics

Mathematical Physics

30 pages, 3 figures

Scientific paper

We consider the self-adjoint third order operator with 1-periodic coefficients on the real line. The spectrum of the operator is absolutely continuous and covers the real line. We determine the high energy asymptotics of the periodic, anti-periodic eigenvalues and of the branch points of the Lyapunov function. Furthermore, in the case of small coefficients we show that either whole spectrum has multiplicity one or the spectrum has multiplicity one except for a small spectral nonempty interval with multiplicity three. In the last case the asymptotics of this small interval is determined.

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