Counting spectrum via the Maslov index for one dimensional -periodic Schrödinger operators
Counting spectrum via the Maslov index for one dimensional -periodic Schrödinger operators
复制标题
通过一维周期性薛定谔算子的马斯洛夫指数计算谱
DOI:
10.1090/proc/13192
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Selim Sukhtaiev
中科院分区:
文献类型:
--
作者:
C. Jones;Y. Latushkin;Selim Sukhtaiev
We study the spectrum of the Schrodinger operators with $n\times n$ matrix valued potentials on a finite interval subject to $\theta-$periodic boundary conditions. For two such operators, corresponding to different values of $\theta$, we compute the difference of their eigenvalue counting functions via the Maslov index of a path of Lagrangian planes. In addition we derive a formula for the derivatives of the eigenvalues with respect to $\theta$ in terms of the Maslov crossing form. Finally, we give a new shorter proof of a recent result relating the Morse and Maslov indices of the Schrodinger operator for a fixed $\theta$.