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arXiv 1201.4199math-phmath.MP
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解析拟周期薛定谔算子与有理频率逼近

Analytic quasi-periodic Schrödinger operators and rational frequency approximants

S. Jitomirskaya, C. A. Marx

摘要:

考虑具有解析势和无理频率$α$的拟周期薛定谔算子$H_{α,θ}$。给定任意有理逼近$α$,令$S_+$和$S_-$分别表示并集,即在$θ$上获得的谱的交点。我们证明了直到零Lebesgue测度的集合,由与$α$的连分式展开相关的周期算子的$S_-$可以渐近地得到绝对连续谱.这证明了Y.最后,在分析案例中。类似地,从$S_+$的渐近性,可以恢复$H_{α,θ}.$的光谱

英文摘要:

Consider a quasi-periodic Schrödinger operator $H_{α,θ}$ with analytic potential and irrational frequency $α$. Given any rational approximating $α$, let $S_+$ and $S_-$ denote the union, respectively, the intersection of the spectra taken over $θ$. We show that up to sets of zero Lebesgue measure, the absolutely continuous spectrum can be obtained asymptotically from $S_-$ of the periodic operators associated with the continued fraction expansion of $α$. This proves a conjecture of Y. Last in the analytic case. Similarly, from the asymptotics of $S_+$, one recovers the spectrum of $H_{α,θ}.$

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