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arXiv 2006.05070hep-th
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非线性西格玛模型中尺度不变性的共形不变性

Conformal invariance from scale invariance in non-linear sigma models

Yu Nakayama

摘要:

有一种观点认为,在偶数维中,标度不变的量子场论是共形不变的。我们可以尝试在$2n + ε$维度上扩展这个论证,但是这个简单的扩展有一个小漏洞,它确实显示了在$2+ε$维度上的非线性西格玛模型中的一个障碍。即使它可能会失败,由于漏洞,我们表明,规模不变性确实意味着共形不变性的非线性西格玛模型在$2+ε$维的开创性工作Perelman的里奇流。

英文摘要:

There exists a certain argument that in even dimensions, scale invariant quantum field theories are conformal invariant. We may try to extend the argument in $2n + ε$ dimensions, but the naive extension has a small loophole, which indeed shows an obstruction in non-linear sigma models in $2+ε$ dimensions. Even though it could have failed due to the loophole, we show that scale invariance does imply conformal invariance of non-linear sigma models in $2+ε$ dimension from the seminal work by Perelman on the Ricci flow.

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