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arXiv 2104.06704math-phmath.MPmath.SGmath.SP
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量子半环面系统的逆谱问题

The inverse spectral problem for quantum semitoric systems

Yohann Le Floch, San Vũ Ngoc

AI总结:

本文研究量子半环面系统的逆谱问题,通过将联合特征值标号算法扩展至谱边界并全局化,证明可从联合谱半经典渐近算法化恢复经典系统的全部辛不变量。

摘要:

给定一个由伪微分算子、Berezin-Toeplitz算子或二者组合构成的量子半环面系统,我们得到了显式公式,可从联合谱的半经典渐近中恢复底层经典半环面系统的所有辛不变量。我们的公式基于这样一种可能性:仅凭联合谱的原始数据即可为联合特征值获得良好的量子数。在对应于动量映射正则值的谱区域中,由Dauge、Hall和第二作者[27]开发的算法能够产生这种标号。在我们的证明中,关键在于将这些算法扩展到谱的边界,这引出了渐近半格的新概念,并将所得标号全局化。利用Pelayo和第二作者在[79]中给出的构造,我们的结果证明半环面系统以算法化方式完全由谱决定:从量子半环面系统的联合谱,可以构造出底层经典半环面系统同构类的一个代表元。特别地,这恢复了Pelayo与作者们在[62,61]中获得的唯一性结果,并通过显式计算包括扭转指数在内的所有不变量对其加以完善。在自旋振子和耦合角动量的情形中,我们实现了这些算法,并数值展示了如何从联合谱计算这些不变量。

英文摘要:

Given a quantum semitoric system composed of pseudodifferential operators, Berezin-Toeplitz operators, or a combination of both, we obtain explicit formulas for recovering, from the semiclassical asymptotics of the joint spectrum, all symplectic invariants of the underlying classical semitoric system. Our formulas are based on the possibility to obtain good quantum numbers for joint eigenvalues from the bare data of the joint spectrum. In the spectral region corresponding to regular values of the momentum map, the algorithms developed by Dauge, Hall and the second author [27] produce such labellings. In our proof, it was crucial to extend these algorithms to the boundary of the spectrum, which led to the new notion of asymptotic half-lattices, and to globalize the resulting labellings. Using the construction given by Pelayo and the second author in [79], our results prove that semitoric systems are completely spectrally determined in an algorithmic way~: from the joint spectrum of a quantum semitoric system one can construct a representative of the isomorphism class of the underlying classical semitoric system. In particular, this recovers the uniqueness result obtained by Pelayo and the authors in [62,61], and completes it with the explicit computation of all invariants, including the twisting index. In the cases of the spin-oscillator and the coupled angular momenta, we implement the algorithms and illustrate numerically the computation of the invariants from the joint spectrum.

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