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arXiv 1204.0260hep-phhep-lathep-thnucl-th
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硬热回路微扰理论概述

A brief overview of hard-thermal-loop perturbation theory

Nan Su

摘要:

有限温度下量子场论的收敛性差一直是热QCD实际应用的主要障碍之一。本文简要回顾了硬热环微扰理论(HTLpt)在重整微扰展开式以提高收敛性方面的进展。以量子力学非简谐振子为例说明了弱耦合展开的破裂,并引入变分微扰理论作为发散弱耦合展开的有效重算方案.本文讨论了QED、纯胶QCD和Nf =3到三圈阶QCD的HTLpt热力学计算。结果表明,HTLpt提供了一个系统的框架,可用于计算静态和动态的量在LHC相关的温度。

英文摘要:

The poor convergence of quantum field theory at finite temperature has been one of the main obstacles in the practical applications of thermal QCD for decades. Here we briefly review the progress of hard-thermal-loop perturbation theory (HTLpt) in reorganizing the perturbative expansion in order to improve the convergence. The quantum mechanical anharmonic oscillator is used as a simple example to show the breakdown of weak-coupling expansion, and variational perturbation theory is introduced as an effective resummation scheme for divergent weak-coupling expansions. We discuss HTLpt thermodynamic calculations for QED, pure-glue QCD, and QCD with N_f=3 up to three-loop order. The results suggest that HTLpt provides a systematic framework that can be used to calculate both static and dynamic quantities for temperatures relevant at LHC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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