arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11020hep-th
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一阶经典场论的拉格朗日约束分析及其在引力中的应用

A Lagrangian constraint analysis of first order classical field theories with an application to gravity

Verónica Errasti Díez, Markus Maier, Julio A. Méndez-Zavaleta, Mojtaba Taslimi Tehrani

摘要:

我们提出了一种优化的方法,明确地获得所有的约束,从而计算传播的自由度(几乎所有)明显的一阶经典场论。我们的建议使用作为其唯一的输入拉格朗日密度和识别的先验独立场变量依赖于。这种坐标依赖,纯粹的拉格朗日方法是补充,并与相关的大量文献完全一致。此外,一般被忽视的技术挑战和问题,从一个不完整的分析详细解决。理论框架是详细说明在麦克斯韦,普罗卡和Palatini理论的所有有限的$d\geq 2$时空维度。我们对帕拉蒂尼引力的新颖分析本身就构成了一组值得注意的结果。特别是,它的计算简单性是可见的,相比以前的哈密顿研究。我们认为,在广义Proca及其耦合重力的背景下,该方法和给定的例子的潜在价值。这一具体建议并没有穷尽该方法的各种可能性。

英文摘要:

We present a method that is optimized to explicitly obtain all the constraints and thereby count the propagating degrees of freedom in (almost all) manifestly first order classical field theories. Our proposal uses as its only inputs a Lagrangian density and the identification of the a priori independent field variables it depends on. This coordinate-dependent, purely Lagrangian approach is complementary to and in perfect agreement with the related vast literature. Besides, generally overlooked technical challenges and problems derived from an incomplete analysis are addressed in detail. The theoretical framework is minutely illustrated in the Maxwell, Proca and Palatini theories for all finite $d\geq 2$ spacetime dimensions. Our novel analysis of Palatini gravity constitutes a noteworthy set of results on its own. In particular, its computational simplicity is visible, as compared to previous Hamiltonian studies. We argue for the potential value of both the method and the given examples in the context of generalized Proca and their coupling to gravity. The possibilities of the method are not exhausted by this concrete proposal.

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