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arXiv 1901.00840hep-th
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用泛函重整化群重整化4PI有效action

Renormalization of the 4PI effective action using the functional renormalization group

M. E. Carrington, S. A. Friesen, C. D. Phillips, D. Pickering

摘要:

基于$n$ -粒子不可约有效作用量的技术可用于研究微扰理论不适用的系统。相对于其他非微扰连续统方法,其主要优点是必须求解的积分方程的层次在作用水平上截断,并且不需要额外的近似。该方法的主要问题是重正化,到目前为止只能在最低($n$ =2)水平上进行。在本文中,我们展示了如何获得重整化的结果,从$n$ -粒子不可约有效作用在任何顺序。我们考虑了四维四次耦合的对称标量理论,并证明了4圈4粒子不可约计算可以用重整化群方法重整化。计算涉及一个裸质量和一个裸耦合常数,它们是在拉格朗日水平上引入的,并且不能通过引入反项来使用任何已知的方法来完成。

英文摘要:

Techniques based on $n$-particle irreducible effective actions can be used to study systems where perturbation theory does not apply. The main advantage, relative to other non-perturbative continuum methods, is that the hierarchy of integral equations that must be solved truncates at the level of the action, and no additional approximations are needed. The main problem with the method is renormalization, which until now could only be done at the lowest ($n$=2) level. In this paper we show how to obtain renormalized results from an $n$-particle irreducible effective action at any order. We consider a symmetric scalar theory with quartic coupling in four dimensions and show that the 4 loop 4-particle-irreducible calculation can be renormalized using a renormalization group method. The calculation involves one bare mass and one bare coupling constant which are introduced at the level of the Lagrangian, and cannot be done using any known method by introducing counterterms.

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