Bound states and the Szegő condition for Jacobi matrices and Schrödinger operators

Bound states and the Szegő condition for Jacobi matrices and Schrödinger operators
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雅可比矩阵和薛定谔算子的束缚态和 Szegő 条件

DOI:
10.1016/s0022-1236(03)00070-3
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发表时间:
2002
影响因子:
1.7
通讯作者:
B. Simon
B. Simon
中科院分区:
数学1区
文献类型:
--
作者:
D. Damanik;D. Hundertmark;B. Simon

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对于Jacobi矩阵an=1+(−1)nαn−γ,bn=(−1)nβn−γ,我们研究了束缚态和Szego条件.我们给出了Nevai结果的一个新的证明,即当γ> 1 2时,Szego条件成立,当用cos(μn)代替(-1)n时,Szego条件也成立.证明了当α=0,β = 0,γ< 1 2时,Szego条件不成立.当γ=1,α和β足够小(β2+8α2<124即可)时,Jacobi矩阵有200个束缚态(当α=0,β大时,有无穷多个束缚态).
For Jacobi matrices with an=1+(−1)nαn−γ, bn=(−1)nβn−γ, we study bound states and the Szegő condition. We provide a new proof of Nevai's result that if γ> 1 2 , the Szegő condition holds, which works also if one replaces (−1)nby cos (μn) . We show that if α=0, β≠0, and γ< 1 2 , the Szegő condition fails. We also show that if γ=1, α and β are small enough (β2+8α2< 1 24 will do), then the Jacobi matrix has finitely many bound states (for α=0, β large, it has infinitely many).