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arXiv 1303.0180hep-thgr-qchep-ph
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弯曲时空中单圈重整化的一种简单方法

A Simple Method for One-Loop Renormalization in Curved Space-Time

Tommi Markkanen, Anders Tranberg

摘要:

本文提出了一种从弯曲时空中的能量动量张量分量导出重整化反项的简单方法。这种方法允许完全控制的有限部分的counterterterms,并提供明确的表达式,为每一项分别。作为一个例子,我们将该方法用于绝热近似下Friedmann-Robertson-Walker度规中的自相互作用标量场,计算了场的重整化运动方程和能量动量张量的重整化分量到第四绝热阶,同时考虑到单圈阶的相互作用.在这种形式主义的痕迹异常,包括相互作用的贡献,示出有一个简单的推导。我们将我们的结果与两种标准方法得到的结果进行比较,发现与Schwinger-DeWitt膨胀一致,但与绝热减法相互作用理论不一致。

英文摘要:

We present a simple method for deriving the renormalization counterterms from the components of the energy-momentum tensor in curved space-time. This method allows full control over the finite parts of the counterterms and provides explicit expressions for each term separately. As an example, the method is used for the self-interacting scalar field in a Friedmann-Robertson-Walker metric in the adiabatic approximation, where we calculate the renormalized equation of motion for the field and the renormalized components of the energy-momentum tensor to fourth adiabatic order while including interactions to one-loop order. Within this formalism the trace anomaly, including contributions from interactions, is shown to have a simple derivation. We compare our results to those obtained by two standard methods, finding agreement with the Schwinger-DeWitt expansion but disagreement with adiabatic subtractions for interacting theories.

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