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arXiv 0707.4437hep-th
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共形低自旋场的常微分公式

Ordinary-derivative formulation of conformal low-spin fields

R. R. Metsaev

摘要:

研究了大于或等于4的偶数维平坦时空中的共形场。给出了自旋为0、1、2的共形玻色子场的二阶导数公式和自旋为1/2、3/2的共形费米子场的一阶导数公式。对于自旋为1,3/2,2的共形场,我们得到了规范不变的拉格朗日量和相应的规范变换.规范对称性是通过涉及Stueckelberg场和辅助场来实现的。实现了全局共形Boost对称性。介绍了修正的Lorentz和de Donder规范条件。得到了四维相互作用Weyl引力的常导数拉格朗日量。在我们的方法中,Weyl引力场的场内容除了共形引力子场外,还包括一个辅助的秩2对称张量场和一个Stueckelberg矢量场。关于辅助张量场,拉格朗日量除了包含其他项外,还包含保利-菲尔斯质量项。利用Weyl引力的常导数拉格朗日量,讨论了Einstein AdS引力与Weyl引力通过破缺共形规范对称性的相互关系.此外,我们演示了使用光锥规范计数壳自由度在高导数共形场论。

英文摘要:

Conformal fields in flat space-time of even dimension greater than or equal to four are studied. Second-derivative formulation for spin 0,1,2 conformal bosonic fields and first-derivative formulation for spin 1/2,3/2 conformal fermionic fields are developed. For the spin 1,3/2,2 conformal fields, we obtain gauge invariant Lagrangians and the corresponding gauge transformations. Gauge symmetries are realized by involving Stueckelberg fields and auxiliary fields. Realization of global conformal boost symmetries is obtained. Modified Lorentz and de Donder gauge conditions are introduced. Ordinary-derivative Lagrangian of interacting Weyl gravity in 4d is obtained. In our approach, the field content of Weyl gravity, in addition to conformal graviton field, includes one auxiliary rank-2 symmetric tensor field and one Stueckelberg vector field. With respect to the auxiliary tensor field, the Lagrangian contains, in addition to other terms, the Pauli-Fierz mass term. Using the ordinary-derivative Lagrangian of Weyl gravity, we discuss interrelation of Einstein AdS gravity and Weyl gravity via breaking conformal gauge symmetries. Also, we demonstrate use of the light-cone gauge for counting on-shell degrees of freedom in higher-derivative conformal field theories.

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