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arXiv 1503.01450hep-th
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光锥规中无张力弦的Anomaly

Anomaly of Tensionless String in Light-cone Gauge

Kenta Murase

摘要:

经典无张力弦论具有时空共形对称性。我们期望并要求量子无张力弦论也有它。在BRST量子化方法中,理论在二维中没有时空共形反常。另一方面,在没有模展开的光锥规范量子化中,$D>3$中的理论在某些算符阶下在$[\mathcal{J}^{-I}, \mathcal{K}^{J}]$的无迹部分存在时空共形反常。本文考虑光锥规范中的无张力闭玻色弦,研究了模展开理论中的时空共形反常。光锥规范中时空共形反常的出现在$D>3$和$D=3$的情况下是不同的,并且取决于算符阶数的选择。因此,我们必须分别考虑$D>3$和$D=3$在各算符阶下的时空共形对称性中的危险算符。具体地说,我们计算危险算子,$D>3$中的$[\mathcal{J}^{-I},\mathcal{K}^{K}]$和$\tilde{\mathcal{K}}^{-}\equiv -i[\mathcal{J}^{-}, \tilde{\mathcal{K}}^{-}]$和$D=3$中的$[\mathcal{J}^{-}, \tilde{\mathcal{K}}^{-}]$,在两种类型的算子顺序。

英文摘要:

The classical tensionless string theory has the spacetime conformal symmetry. We expect and require that the quantum tensionless string theory has it too. In the BRST quantization method, the theory has no spacetime conformal anomaly in two dimensions. On the other hand, in the light-cone gauge quantization without the mode expansion, the theory in $D>3$ has the spacetime conformal anomaly in the traceless part of $[\mathcal{J}^{-I}, \mathcal{K}^{J}]$ in some operator order. In this paper, we consider a tensionless closed bosonic string in the light-cone gauge and investigate the spacetime conformal anomaly in the theory with the mode expansion. The appearance of the spacetime conformal anomaly in the light-cone gauge is different between the case of $D>3$ and the case of $D=3$ and depends on the choice of the operator order. Therefore we must consider dangerous commutators in the spacetime conformal symmetry of $D>3$ and $D=3$ in each operator order separately. Specifically we calculate dangerous commutators, $[\mathcal{J}^{-I},\mathcal{K}^{K}]$ in $D>3$ and $\tilde{\mathcal{K}}^{-}\equiv -i[\mathcal{J}^{-}, \tilde{\mathcal{K}}^{-}]$ and $[\mathcal{J}^{-}, \tilde{\mathcal{K}}^{-}]$ in $D=3$, in two types of the operator order.

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