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arXiv math-ph/0510052math-phmath.MP
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QFT和LCQFT中的UV和IR行为,字段为算子值分布:Epstein和Glaser重新访问

UV and IR behaviour in QFT and LCQFT with fields as Operator Valued Distributions:Epstein and Glaser revisited

Pierre Ca Grange, Ernst Werner

摘要:

在Epstein-Glaser的工作之后,我们展示了基于算子值分布(OPVD)的QFT公式如何以数学上严格的方式处理对角线上传播子的原始奇异性。从而在任何阶段都避免了UV和/或IR发散,只有有限重整化最终发生在与测试函数中存在的任意尺度相关的点处。本文对自由质量标量场理论在质量微扰展开(通常是无望的)中的应用,证明了IR处理的威力,并指出这种方法对于通常难以确定反项的非微扰方法是最有用的

英文摘要:

Following Epstein-Glaser's work we show how a QFT formulation based on operator valued distributions (OPVD) with adequate test functions treats original singularities of propagators on the diagonal in a mathematically rigourous way.Thereby UV and/or IR divergences are avoided at any stage, only a finite renormalization finally occurs at a point related to the arbitrary scale present in the test functions.Some well known UV cases are examplified.The power of the IR treatment is shown for the free massive scalar field theory developed in the (conventionally hopeless) mass perturbation expansion.It is argued that the approach should prove most useful for non pertubative methods where the usual determination of counterterms is elusive

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