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arXiv 1402.6322hep-th
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标度不变性、保形性和广义自由场

Scale Invariance, Conformality, and Generalized Free Fields

Anatoly Dymarsky, Kara Farnsworth, Zohar Komargodski, Markus A. Luty, Valentina Prilepina

摘要:

讨论了四维洛伦兹不变么正量子场论是否存在标度不变性而非共形不变性的问题。Luty-Polchinski-Rattazzi和Dymarsky-Komargodski-Schwimmer-Theisen的论证中的一个重要漏洞是能量动量张量$T$的迹可以是广义自由场。在本文中,我们排除了这种可能性。关键成分是观察到,一个具有尺度但不具有共形不变性的幺正理论,对于全局尺度变换必然具有非零异常。我们表明,这种异常不能再现,如果$T$是一个广义自由场,除非理论还包含一个2维标量算子。在特殊的情况下,这样的运营商是目前它可以用来重新定义(“改善”)的能量动量张量,我们表明,至少有一个能量动量张量是不是一个广义自由场。此外,我们强调,在一般情况下,大的动量极限的关联函数不能理解的坐标空间OPE的领先条款。这就否定了Farnslove-Luty-Prilepina(FLP)最近的一个论点。尽管FLP的一般论点是无效的,但其中一些技术在目前的情况下是有用的。

英文摘要:

This paper addresses the question of whether there are 4D Lorentz invariant unitary quantum field theories with scale invariance but not conformal invariance. An important loophole in the arguments of Luty-Polchinski-Rattazzi and Dymarsky-Komargodski-Schwimmer-Theisen is that trace of the energy-momentum tensor $T$ could be a generalized free field. In this paper we rule out this possibility. The key ingredient is the observation that a unitary theory with scale but not conformal invariance necessarily has a non-vanishing anomaly for global scale transformations. We show that this anomaly cannot be reproduced if $T$ is a generalized free field unless the theory also contains a dimension-2 scalar operator. In the special case where such an operator is present it can be used to redefine ("improve") the energy-momentum tensor, and we show that there is at least one energy-momentum tensor that is not a generalized free field. In addition, we emphasize that, in general, large momentum limits of correlation functions cannot be understood from the leading terms of the coordinate space OPE. This invalidates a recent argument by Farnsworth-Luty-Prilepina (FLP). Despite the invalidity of the general argument of FLP, some of the techniques turn out to be useful in the present context.

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