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arXiv 2512.16596hep-thgr-qc
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二维标量场模型的迹异常

Trace anomaly for a conformal 2D vector field model

Universidade Federal do Espı́rito Santo(圣埃斯皮里图联邦大学);Universidade Federal de Juiz de Fora(茹伊斯德福拉联邦大学)

Samuel W. P. Oliveira, Ilya L. Shapiro

AI总结:

本文研究了二维向量场模型的迹异常,通过维数正则化方法处理一阶发散项,并比较了标量和费米子的异常情况。

摘要:

对于具有经典共形对称性的二维向量理论,评估了迹异常和异常诱导作用量。在保持规范不变性的条件下实现局部共形对称性,需要要么放弃经典作用的局域性,或者等效地引入辅助标量场。此类理论的二维极限是奇异的。然而,在维数正则化中,一阶发散项在D→2的极限下是平滑的。因此,我们得到了一个具有丰富一般结构的异常表达式,这与D≥4维的情况典型相符。为了比较和完整性,我们还评估了共形标量和费米子在存在辅助外部标量场时的异常。

英文摘要:

The trace anomaly and anomaly-induced action are evaluated for the two-dimensional $2D$ vector theory with classical conformal symmetry. Implementing local conformal symmetry while preserving the gauge invariance requires either giving up locality of the classical action or, equivalently, introducing an auxiliary scalar field. The two-dimensional limit in such a theory is singular. However, in the dimensional regularization, the limit $D \to 2$ in the one-loop divergence is smooth. As a result, we arrive at the expression for anomaly, which has a rich general structure, typical for the dimensions $D \geq 4$. For comparison and completeness, we also evaluate anomalies for conformal scalar and fermions, also in the presence of auxiliary external scalars.

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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