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arXiv 2108.04079hep-th
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(1+1)维Gross-Neveu模型有效势的重整化群改进

Renormalization group improvement of the effective potential in a (1+1) dimensional Gross-Neveu model

A. G. Quinto, R. Vega Monroy, A. F. Ferrari

摘要:

本文研究了(1+1)维时空中N个费米子场的Gross-Neveu(GN)模型的重整化群方程(RGE)在确定有效势和研究动力学对称破缺(DSB)中的作用,该模型可以用来描述聚乙炔的某些性质.该模型的经典拉格朗日量是标度不变的,但当经典拉格朗日量的一个无量纲参数(耦合常数)被交换为一个有量纲参数(费米子场的动态质量)时,对有效势的辐射修正会导致维数变换。对于我们正在考虑的模型,有效势和重整化群函数的微扰计算可达三个循环,但我们使用RGE和领先的日志近似计算改进的有效势,包括贡献高达六个循环的订单。然后,我们进行了系统的研究的一般方面的DSB在GN模型与有限的N,比较我们得到的结果来自原始的未改进的有效潜力,我们开始。

英文摘要:

In this work, we investigate the consequences of the Renormalization Group Equation (RGE) in the determination of the effective potential and the study of Dynamical Symmetry Breaking (DSB) in an Gross-Neveu (GN) model with N fermions fields in (1+1) dimensional space-time, which can be applied as a model to describe certain properties of the polyacetylene. The classical Lagrangian of the model is scale invariant, but radiative corrections to the effective potential can lead to dimensional transmutation, when a dimensionless parameter (coupling constant) of the classical Lagrangian is exchanged for a dimensionful one, a dynamically generated mass for the fermion fields. For the model we are considering, perturbative calculations of the effective potential and renormalization group functions up to three loops are available, but we use the RGE and the leading logs approximation to calculate an improved effective potential, including contributions up to six loops orders. We then perform a systematic study of the general aspects of DSB in the GN model with finite N, comparing the results we obtain with the ones derived from the original unimproved effective potential we started with.

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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