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arXiv 1907.06503hep-thcond-mat.stat-mech
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泛函重整化群的替代流方程

Alternative flow equation for the functional renormalization group

Elizabeth Alexander, Peter Millington, Jordan Nursey, Paul M. Saffin

摘要:

我们推导出一个替代的Wetterich-Morris-Ellwanger方程的两粒子不可约(2 PI)的有效作用量,利用由于Garbrecht和Millington的外部来源的方法。后者允许的两点源的2 PI有效的行动,始终与调节器的重整化群流。我们表明,这一过程导致的流量方程,从标准的方法中获得的平均单粒子不可约有效作用的基础上不同。

英文摘要:

We derive an alternative to the Wetterich-Morris-Ellwanger equation by means of the two-particle irreducible (2PI) effective action, exploiting the method of external sources due to Garbrecht and Millington. The latter allows the two-point source of the 2PI effective action to be associated consistently with the regulator of the renormalization group flow. We show that this procedure leads to a flow equation that differs from that obtained in the standard approach based on the average one-particle irreducible effective action.

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