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arXiv 0908.0365gr-qc
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Hilbert拉格朗日量和等距嵌入:Regge-Teitelboim引力的四元组形式

The Hilbert Lagrangian and Isometric Embedding: Tetrad Formulation of Regge-Teitelboim Gravity

Frank B. Estabrook

摘要:

本文讨论真空引力场的外微分系统。这些EDS是通过改变希尔伯特-爱因斯坦拉格朗日量得到的,最优雅的是作为一个Cartan 4-formrm校准嵌入在10个平坦维度中的4-空间。特别是我们因此制定与四元方程的雷吉-泰特尔博伊姆动力学“拉弦”(R-T);它出现时,变化的4空间给出了欧拉-拉格朗日方程的多接触场论。我们计算了这个EDS的Cartan特征表,显示了场方程在没有规范自由度的情况下是适定的。希尔伯特拉格朗日量通常只在四维空间的内禀曲率结构上变化,只产生这种动力学的一个子集,即,解满足限制它们为Ricci平坦的附加条件。在静态球对称的情况下,我们提出了一个新的四元组嵌入在平坦的六个维度,它允许减少的R-T场方程的正交,史瓦西度规是一个特殊的情况。如前所述,R-T理论与膜理论的隐藏维度之间可能存在经典的对应关系,而且这种广义相对论动力学在极端情况下也可能成立,在极端情况下,它可以被解释为包含一种暗能量或体能量,尽管拉格朗日量中不包含任何具有宇宙学常数的项。作为一个多接触系统,正则量子化应该是直接的。

英文摘要:

We discuss Exterior Differential Systems (EDS) for the vacuum gravitational field. These EDS are derived by varying the Hilbert-Einstein Lagrangian, given most elegantly as a Cartan 4-forrm calibrating 4-spaces embedded in ten flat dimensions. In particular we thus formulate with tetrad equations the Regge-Teitelboim dynamics "a la string" (R-T); it arises when variation of the 4-spaces gives the Euler-Lagrange equations of a multicontact field theory. We calculate the Cartan character table of this EDS, showing the field equations to be well posed with no gauge freedom. The Hilbert Lagrangian as usually varied over just the intrinsic curvature structure of a 4-space yields only a subset of this dynamics, viz., solutions satisfying additional conditions constraining them to be Ricci-flat. In the static spherically symmetric case we present a new tetrad embedding in flat six dimensions, which allows reduction of the R-T field equations to a quadrature; the Schwarzschild metric is a special case. As has previously been noted there may be a classical correspondence of R-T theory with the hidden dimensions of brane theory, and perhaps this extended general relativistic dynamics holds in extreme circumstances where it can be interpreted as including a sort of dark or bulk energy, even though no term with a cosmological constant is included in the Lagrangian. As a multicontact system, canonical quantization should be straightforward.

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