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arXiv 1107.4280hep-th
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由分支点扭场证明一个c定理

Arguments towards a c-theorem from branch-point twist fields

Olalla A. Castro-Alvaredo, Benjamin Doyon, Emanuele Levi

摘要:

1+1维量子场论中的一个基本量是扎莫洛奇科夫的c函数。一个重整化群距离参数r的函数,在紫外和红外固定点之间插值,其值通常被解释为在特定能量标度下模型自由度的数量的度量。c定理证明了c(r)是r的单调递减函数,并且它的导数只能在量子临界点处为零。在这些点上,c(r)成为描述临界点的共形场论的中心荷。在这封信中,我们认为,卡拉布雷斯和卡迪提出的一个不同的功能,定义的两点函数的分支点扭曲场和应力能量张量的痕迹,具有完全相同的定性特征c(r)。

英文摘要:

A fundamental quantity in 1+1 dimensional quantum field theories is Zamolodchikov's c-function. A function of a renormalization group distance parameter r that interpolates between UV and IR fixed points, its value is usually interpreted as a measure of the number of degrees of freedom of a model at a particular energy scale. The c-theorem establishes that c(r) is a monotonically decreasing function of r and that its derivative may only vanish at quantum critical points. At those points c(r) becomes the central charge of the conformal field theory which describes the critical point. In this letter we argue that a different function proposed by Calabrese and Cardy, defined in terms of the two-point function of a branch point twist field and the trace of the stress-energy tensor, has exactly the same qualitative features as c(r).

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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