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arXiv 0908.1954hep-th
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$D=2+1$中线性化Weyl对称自旋2理论的么正性

Unitarity of spin-2 theories with linearized Weyl symmetry in $D=2+1$

D. Dalmazi

摘要:

本文通过研究自旋为2的四阶自对偶模型传播子的解析结构,证明了该模型的么正性。该模型描述了$D=2+1$中螺旋度为+2(或-2)的大质量粒子,对应于平坦背景下高导数拓扑大质量引力的二次截断。这是一个有趣的例子,证明了传播子中的一个项(形式为$1/\lbrack\Box^2 (\Box - m^2)\rbrack $)不会导致幽灵。指出了线性化外尔对称性在消除鬼现象中的重要作用。我们使用了一对特殊的规范条件,分别固定了线性化重参数化和线性化Weyl对称性。

英文摘要:

Here we prove unitarity of the recently found fourth-order self-dual model of spin-2 by investigating the analytic structure of its propagator. The model describes massive particles of helicity +2 (or -2) in $D=2+1$ and corresponds to the quadratic truncation of a higher derivative topologically massive gravity about a flat background. It is an intriguing example of a theory where a term in the propagator of the form $1/\lbrack\Box^2 (\Box - m^2)\rbrack $ does not lead to ghosts. The crucial role of the linearized Weyl symmetry in getting rid of the ghosts is pointed out. We use a peculiar pair of gauge conditions which fix the linearized reparametrizations and linearized Weyl symmetries separetely.

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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