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arXiv 0710.3040hep-th
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微扰量子场论中在壳层和离壳层形式的关系

Relating on-shell and off-shell formalism in perturbative quantum field theory

Christian Brouder, Michael Duetsch

摘要:

在壳上形式(主要用于微扰量子场论)中,时间序积T的元素是壳上场(即基本场满足自由场方程)。因此,T的(多重)线性与Action沃德恒等式不相容。这可以通过使用脱壳形式来规避,其中T的条目是脱壳字段。为了正确地联系在壳和离壳形式主义,Duetsch和Fredenhof公理化地引入了从在壳场到离壳场的映射sigma。在这篇论文中,它表明,在一个真正的标量场的情况下,在N=4维Minkowski空间,这些公理有一个唯一的解决方案。然而,这个解决方案只是递归地给出的。我们解决了这个递归关系,并给出了一个完全明确的表达式,在标量场,狄拉克和规范场的情况下,任意值的维数N。

英文摘要:

In the on-shell formalism (mostly used in perturbative quantum field theory) the entries of the time ordered product T are on-shell fields (i.e. the basic fields satisfy the free field equations). With that, (multi)linearity of T is incompatible with the Action Ward identity. This can be circumvented by using the off-shell formalism in which the entries of T are off-shell fields. To relate on- and off-shell formalism correctly, a map sigma from on-shell fields to off-shell fields was introduced axiomatically by Duetsch and Fredenhagen. In that paper it was shown that, in the case of one real scalar field in N=4 dimensional Minkowski space, these axioms have a unique solution. However, this solution was given there only recursively. We solve this recurrence relation and give a fully explicit expression for sigma in the cases of the scalar, Dirac and gauge fields for arbitrary values of the dimension N.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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