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arXiv 1903.09201gr-qchep-thmath-phmath.MP
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再论Holst action第二类约束的求解

Revisiting the solution of the second-class constraints of the Holst action

Merced Montesinos, Jorge Romero, Mariano Celada

摘要:

在本文中,我们重新审视非明显的洛伦兹协变正则分析的霍尔斯特作用量与宇宙学常数。我们采取了与F. Cianfrani和G. Montani [Phys. Rev. Lett. 102,091301(2009)]并意识到作者提供的第二类约束的解决方案是不完整的,因此不能解释广义相对论的正确局部动力学。然后,我们通过将缺少的自由度添加到解中来改进他们的方法,并对所得理论进行完整描述,该理论保留了洛伦兹不变性,但被证明具有非正则辛结构。后来,我们不借助任何规范条件,进行了达布变换,使这个理论成为一个标准形式。最后,我们表明,在时间规范的两个配方,即非规范和规范的,导致Ashtekar-Barbero变量。

英文摘要:

In this paper we revisit the nonmanifestly Lorentz-covariant canonical analysis of the Holst action with a cosmological constant. We take a viewpoint close to that of F. Cianfrani and G. Montani [Phys. Rev. Lett. 102, 091301 (2009)] and realize that the solution of the second-class constraints that the authors provide is incomplete, thus not accounting for the correct local dynamics of general relativity. We then mend their approach by adding the missing degrees of freedom to the solution and give a complete description of the resulting theory, which preserves Lorentz invariance but turns out to be endowed with a noncanonical symplectic structure. Later on and without resorting to any gauge condition, we perform a Darboux transformation to bring this theory into a canonical form. Finally, we show that in the time gauge both formulations, namely the noncanonical and the canonical ones, lead to the Ashtekar-Barbero variables.

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