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arXiv 1306.4593hep-thhep-ph
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标量场理论中的场重定义与可重整性

Field redefinition and renormalisability in scalar field theories

N. Mohammedi

摘要:

我们已经讨论了与可重正性相关的字段重定义问题。我们的研究仅限于相互作用的标量场理论。我们特别指出,如果一个理论在通常的幂次计数意义上是可重整的,那么在变量改变后,它在同样的意义上仍然是可重整的。这是由于使用了强大的背景场扩展方法。在单个复尺度场的情况下,使用极坐标时,反项的确定要简单得多。我们通过在后一种情况下进行单循环计算来说明这一点。

英文摘要:

We have addressed the issue of field redefinition in connection with renormalisability. Our study is restricted to theories of interacting scalar fields. We have, in particular, shown that if a theory is renormalisable in the usual power-counting sense then it remains renormalisable in the same sense after a change of variables. This is due to the use of the powerful method of the background field expansion. In the case of a single complex sclar field, it turns out that the determination of the counter-terms is much simpler when polar coordinates are used. We illustate this by carrying out a one-loop calculation in the latter case.

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