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arXiv 1302.3796hep-ph
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硬热环膨胀中次主导阶的热场论

Thermal field theory at next-to-leading order in the hard thermal loop expansion

A. Mirza, M. E. Carrington

摘要:

本文研究次超前阶的硬热环有效理论。标准的功率计算预测,可能需要计算大量的图,包括2回路图。然而,在所有已经完成的计算中,除了光子自能之外,完全的次领先阶贡献可以通过仅计算具有有效线和顶点的软1-回路图来获得。了解光子自能是否是这一规则的唯一例外,或者是否还有其他例外,以及哪些例外,是很有意义的。在本文中,我们使用实时有限温度场论,这是特别适合的任务进行了细化的功率计数分析。我们发现,标准的功率计数规则从虚时间形式主义通常高估的大小的2-循环图。我们认为,唯一的例外的规则,1-循环软图给下一个到领先的顺序的贡献是$2n$ -光子顶点。

英文摘要:

In this paper we study the hard-thermal-loop effective theory at next-to-leading order. Standard power-counting predicts that a large number of diagrams, including 2-loop diagrams, may need to be calculated. In all of the calculations that have been done however, with the exception of the photon self-energy, the full next-to-leading order contribution can be obtained by calculating only soft 1-loop diagrams with effective lines and vertices. It is of interest to know if the photon self-energy is the only exception to this rule, or if there are others, and which ones. In this paper we perform a refined power-counting analysis using real-time finite temperature field theory which is particularly well suited to the task. We show that the standard power-counting rules obtained from the imaginary time formalism usually over-estimate the size of the 2-loop diagrams. We argue that the only exceptions to the rule that the 1-loop soft diagrams give the next-to-leading order contribution are $2n$-photon vertices.

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