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arXiv 2302.04816math-phmath.APmath.FAmath.MPquant-ph
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投影算子的最优半经典正则性与强Weyl定律

Optimal Semiclassical Regularity of Projection Operators and Strong Weyl Law

Laurent Lafleche

AI总结:

本文证明投影算子在半经典极限下收敛于相空间特征函数,并具有与特征函数相同的最大量子Sobolev正则性,回答了投影算子作为初始数据的可能性问题,并给出Weyl定律的强收敛结果。

摘要:

投影算子自然地出现在量子力学和行列式过程研究中,作为与Slater行列式相关的单粒子密度算子。在量子力学的半经典近似背景下,投影算子可视为相空间子集特征函数的类比,而特征函数是不连续的。我们证明投影算子确实收敛于相空间的特征函数,并且在量子Sobolev空间的意义下,它们展现出与特征函数相同的最大正则性。这可以解释为Schatten范数中交换子大小的半经典渐近行为。我们的研究回答了[J. Chong, L. Lafleche, C. Saffirio, arXiv:2103.10946 [math.AP]]中提出的关于投影算子能否作为初始数据的问题,并给出了相空间中Weyl定律在Sobolev空间中的强收敛结果。

英文摘要:

Projection operators arise naturally as one-particle density operators associated to Slater determinants in fields such as quantum mechanics and the study of determinantal processes. In the context of the semiclassical approximation of quantum mechanics, projection operators can be seen as the analogue of characteristic functions of subsets of the phase space, which are discontinuous functions. We prove that projection operators indeed converge to characteristic functions of the phase space and that in terms of quantum Sobolev spaces, they exhibit the same maximal regularity as characteristic functions. This can be interpreted as a semiclassical asymptotic on the size of commutators in Schatten norms. Our study answers a question raised in [J. Chong, L. Lafleche, C. Saffirio, arXiv:2103.10946 [math.AP]] about the possibility of having projection operators as initial data. It also gives a strong convergence result in Sobolev spaces for the Weyl law in phase space.

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