Number of eigenvalues for a class of non-selfadjoint Schrödinger operators

Details Number of eigenvalues for a class of non-selfadjoint Schrödinger operators Number of eigenvalues for a class of non-selfadjoint Schrödinger operators

2009-02-05

arxiv.org/abs/0902.0921v3

Mathematics

Spectral Theory

19 pages

Scientific paper

In this article, we prove the finiteness of the number of eigenvalues for a class of Schr\"odinger operators $H = -\Delta + V(x)$ with a complex-valued potential $V(x)$ on $\bR^n$, $n \ge 2$. If $\Im V$ is sufficiently small, $\Im V \le 0$ and $\Im V \neq 0$, we show that $N(V) = N(\Re V)+ k$, where $k$ is the multiplicity of the zero resonance of the selfadjoint operator $-\Delta + \Re V$ and $N(W)$ the number of eigenvalues of $-\Delta + W$, counted according to their algebraic multiplicity.

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