arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2003.02773hep-thcond-mat.other
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Wilson Action(适用于$O(N)$型号)

Wilson Action for the $O(N)$ Model

Semanti Dutta, B. Sathiapalan, H. Sonoda

摘要:

本文将临界$O(N)$模型在$D=4-\eps$维上的不动点Wilson作用量记为$\eps^2$阶的$\eps$展开式.它是通过求解不动点的Polchinski精确重整化群方程(具有反常维数)的$\eps$幂而得到的。这是一个例子的理论,具有规模和共形不变性,尽管有一个有限的UV截止。这个理论的能量-动量张量也被构造成(在零动量时)$\eps^2$阶。这是通过求解不动点作用量的Ward-Takahashi恒等式来完成的。证实了能量-动量张量的迹与由精确RG给出的尺度不变性的破坏成比例,即,$β$功能。迹线在固定点处的消失确保了共形不变性。还给出了一些关联函数计算的例子。

英文摘要:

In this paper the fixed-point Wilson action for the critical $O(N)$ model in $D=4-\eps$ dimensions is written down in the $\eps$ expansion to order $\eps^2$. It is obtained by solving the fixed-point Polchinski Exact Renormalization Group equation (with anomalous dimension) in powers of $\eps$. This is an example of a theory that has scale and conformal invariance despite having a finite UV cutoff. The energy-momentum tensor for this theory is also constructed (at zero momentum) to order $\eps^2$. This is done by solving the Ward-Takahashi identity for the fixed point action. It is verified that the trace of the energy-momentum tensor is proportional to the violation of scale invariance as given by the exact RG, i.e., the $β$ function. The vanishing of the trace at the fixed point ensures conformal invariance. Some examples of calculations of correlation functions are also given.

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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