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arXiv 1409.3497math-phmath.MP
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度量算子、广义厄米性与Hilbert空间格

Metric operators, generalized hermiticity and lattices of Hilbert lpaces

Jean-Pierre Antoine, Camillo Trapani

摘要:

准埃尔米特算子是通过度量算子在某种意义上类似于其伴随算子的算子,即,严格正自伴算子鉴于这些度量算子一般被假定为有界的,我们分析了Hilbert空间中无界度量算子所产生的结构。事实证明,这样的算子生成希尔伯特空间的规范格,即部分内积空间(PIP-空间)的最简单情况。我们介绍了几个概括的概念之间的相似性的运营商,特别是准相似性的概念,我们探讨到什么程度,他们保持谱特性。然后,我们将前面的一些结果应用到一个特定的PIP-空间上的算子,即由度量算子生成的Hilbert空间的尺度。最后,受最近伪厄米量子力学发展的启发,我们重新表述了前面形式主义中的伪厄米算子的概念。

英文摘要:

A quasi-Hermitian operator is an operator that is similar to its adjoint in some sense, via a metric operator, i.e., a strictly positive self-adjoint operator. Whereas those metric operators are in general assumed to be bounded, we analyze the structure generated by unbounded metric operators in a Hilbert space. It turns out that such operators generate a canonical lattice of Hilbert spaces, that is, the simplest case of a partial inner product space (PIP-space). We introduce several generalizations of the notion of similarity between operators, in particular, the notion of quasi-similarity, and we explore to what extend they preserve spectral properties. Then we apply some of the previous results to operators on a particular PIP-space, namely, a scale of Hilbert spaces generated by a metric operator. Finally, motivated by the recent developments of pseudo-Hermitian quantum mechanics, we reformulate the notion of pseudo-Hermitian operators in the preceding formalism.

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