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arXiv math/9904127math.OAhep-thmath-phmath.FAmath.MPmath.RT
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规范不变拟自由自同态的电荷量子数

The Charge Quantum Numbers of Gauge Invariant Quasi-free Endomorphisms

C. Binnenhei

摘要:

研究了在Fock空间上实现拟自由自同态ρ的等距H_ρ的希尔伯特空间上出现的规范对易或反对易关系的规范自同构群的表示.这种表示表征了局域量子场论中ρ的“荷”,它由H_ρ本身的Fock空间结构决定:除了群的“基本”表示外,所有更高的对称或反对称张量幂幂也出现了。因此,ρ是可约的,除非它是一个自同构。通过二维无质量Dirac场的例子进一步说明了拟自由自同态的局部化性和可实现性是相容的。

英文摘要:

The representations of a group of gauge automorphisms of the canonical commutation or anticommutation relations which appear on the Hilbert spaces of isometries H_ρimplementing quasi-free endomorphisms ρon Fock space are studied. Such a representation, which characterizes the "charge" of ρin local quantum field theory, is determined by the Fock space structure of H_ρitself: Together with a "basic" representation of the group, all higher symmetric or antisymmetric tensor powers thereof also appear. Hence ρis reducible unless it is an automorphism. It is further shown by the example of the massless Dirac field in two dimensions that localization and implementability of quasi-free endomorphisms are compatible with each other.

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