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arXiv 0905.1068hep-th
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关于任意维质量引力子和压缩挠率的讨论

A Discussion on Massive Gravitons and Propagating Torsion in Arbitrary Dimensions

C. A Hernaski, A. A. Vargas-Paredes, J. A. Helayël-Neto

摘要:

在本文中,我们重新评估一个特殊的$R^{2}$型重力作用量在D维,最近研究Nakasone和Oda,现在考虑扭转效应。考虑到vielbein和自旋连接携带独立的传播自由度,我们得出结论,鬼和快子是不存在的,只有当扭转是非传播的,我们还得出结论,有质量的引力子没有空间。为了包括这些激励,我们了解如何扩大Nakasone-Oda的模型通过明确的扭转项的行动,我们讨论了任意尺寸的扩大模型的么正性。

英文摘要:

In this paper, we reassess a particular $R^{2}$-type gravity action in D dimensions, recently studied by Nakasone and Oda, taking now torsion effects into account. Considering that the vielbein and the spin connection carry independent propagating degrees of freedom, we conclude that ghosts and tachyons are absent only if torsion is non-propagating, and we also conclude that there is no room for massive gravitons. To include these excitations, we understand how to enlarge Nakasone-Oda's model by means of explicit torsion terms in the action and we discuss the unitarity of the enlarged model for arbitrary dimensions.

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