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arXiv 1703.04091math-phmath.MPquant-ph
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边界上的自伴扩张与酉算子

Self-adjoint extensions and unitary operators on the boundary

Paolo Facchi, Giancarlo Garnero, Marilena Ligabò

摘要:

建立了有界正则区域上Laplace算子的自伴扩张与边界上酉算子的双射。每一个酉编码函数的边界值和它的正规导数之间的特定关系。这个双射建立了一个被限制在腔中的非相对论性量子粒子的所有物理上允许的动力学的特征。此外,还在二次型的层次上讨论了这种对应关系.最后,这个参数化的扩展和经典的,在封闭的子空间上的边界自伴算子之间的连接。

英文摘要:

We establish a bijection between the self-adjoint extensions of the Laplace operator on a bounded regular domain and the unitary operators on the boundary. Each unitary encodes a specific relation between the boundary value of the function and its normal derivative. This bijection sets up a characterization of all physically admissible dynamics of a nonrelativistic quantum particle confined in a cavity. More- over, this correspondence is discussed also at the level of quadratic forms. Finally, the connection between this parametrization of the extensions and the classical one, in terms of boundary self-adjoint operators on closed subspaces, is shown.

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