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arXiv 1705.00569math-phgr-qchep-thmath.MP
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Einstein-Hilbert引力的多辛统一形式

Multisymplectic unified formalism for Einstein-Hilbert Gravity

Jordi Gaset, Narciso Román-Roy

摘要:

给出了广义相对论的Einstein-Hilbert模型的协变多辛公式。由于它是由二阶奇异拉格朗日量描述的,这是一个有约束的规范场理论。统一的拉格朗日-哈密顿形式主义的使用是特别有趣的,当它被应用到这些类型的理论,因为它简化了他们的治疗;特别是,约束算法的实施,检索的拉格朗日描述,和协变哈密顿形式主义的建设。为了将该算法应用于协变场方程,它们必须以适当的几何方式书写,其中包括使用由某种类型的多向量场表示的可积分布。我们将所有这些工具应用到没有和有能量物质源的Einstein-Hilbert模型。我们获得并解释的几何和物理意义的拉格朗日约束,我们构建的多动量(协变)哈密顿形式主义在这两种情况下。作为规范自由和约束算法的结果,我们看到这个模型是如何等价于一阶正则理论的,没有规范自由。在存在能量物质源的情况下,我们展示了一些相关的几何和物理特性的理论取决于源的类型。在所有情况下,我们得到明确的多重向量场,这是引力场方程的解。最后,简要研究对称性和守恒定律是在这种情况下。

英文摘要:

We present a covariant multisymplectic formulation for the Einstein-Hilbert model of General Relativity. As it is described by a second-order singular Lagrangian, this is a gauge field theory with constraints. The use of the unified Lagrangian-Hamiltonian formalism is particularly interesting when it is applied to these kinds of theories, since it simplifies the treatment of them; in particular, the implementation of the constraint algorithm, the retrieval of the Lagrangian description, and the construction of the covariant Hamiltonian formalism. In order to apply this algorithm to the covariant field equations, they must be written in a suitable geometrical way, which consists of using integrable distributions, represented by multivector fields of a certain type. We apply all these tools to the Einstein-Hilbert model without and with energy-matter sources. We obtain and explain the geometrical and physical meaning of the Lagrangian constraints and we construct the multimomentum (covariant) Hamiltonian formalisms in both cases. As a consequence of the gauge freedom and the constraint algorithm, we see how this model is equivalent to a first-order regular theory, without gauge freedom. In the case of presence of energy-matter sources, we show how some relevant geometrical and physical characteristics of the theory depend on the type of source. In all the cases, we obtain explicitly multivector fields which are solutions to the gravitational field equations. Finally, a brief study of symmetries and conservation laws is done in this context.

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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