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arXiv 1908.01937hep-th
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弯曲空间中有效场论的标量模型

Scalar model of effective field theory in curved space

Tiago G. Ribeiro, Ilya L. Shapiro

摘要:

我们比以前更详细地考虑了光标量场与另一个质量大得多的标量场耦合的量子理论中的有效低能行为。我们工作的主要目标是重自由度的IR解耦,包括在循环中具有混合轻重内容的图中。结果表明,具有混合内部线的单圈图产生的红外非定域贡献与光标量理论中的贡献完全相同,而有效的自相互作用可以通过重标量的泛函积分得到,几乎可以忽略其动力学项.同样的效果也发生在弯曲的空间中,不管有效模型中出现的大量非定域性。

英文摘要:

We consider, in more details than it was done previously, the effective low-energy behavior in the quantum theory of a light scalar field coupled to another scalar with much larger mass. The main target of our work is an IR decoupling of heavy degrees of freedom, including in the diagrams with mixed light-heavy contents in the loops. It is shown that the one-loop diagrams with mixed internal lines produce an IR non-local contributions which are exactly the same as the ones in the theory of the light scalar alone, with the effective self-interaction which can be obtained by the functional integration of the heavy scalar, almost neglecting its kinetic term. The same effect takes place in curved space, regardless of a larger amount of non-localities which show up in the effective model.

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