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arXiv math-ph/0201016math-phhep-thmath.MP
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作为可观测量的共形变换

Conformal Transformations as Observables

Soeren Koester

摘要:

C表示在3+1维中的共形群,或在一个手征维中的共形群。设U是C的一个酉强连续表示,满足谱条件,并通过它的伴随作用诱导v.Neumann代数A的自同构。我们构造了实现这些自同构的C的泛覆盖群的唯一内部表示U^A。U^A满足谱条件,并平凡地作用于任何U-不变向量。这特别意味着:具有正能量的场论的共形变换是局部观测量的弱极限点。一些直接的影响,手性双链。我们建议命名为“Borchers-Sugawara建设”。

英文摘要:

C denotes either the conformal group in 3+1 dimensions, or in one chiral dimension. Let U be a unitary, strongly continuous representation of C satisfying the spectrum condition and inducing, by its adjoint action, automorphisms of a v.Neumann algebra A. We construct the unique inner representation U^A of the universal covering group of C implementing these automorphisms. U^A satisfies the spectrum condition and acts trivially on any U-invariant vector. This means in particular: Conformal transformations of a field theory having positive energy are weak limit points of local observables. Some immediate implications for chiral subnets are given. We propose the name ``Borchers-Sugawara construction''.

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