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arXiv 1609.01946hep-thgr-qc
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正则张量模型的运动方程与广义相对论的Hamilton-Jacobi方程

Equation of motion of canonical tensor model and Hamilton-Jacobi equation of general relativity

Hua Chen, Naoki Sasakura, Yuki Sato

备注：
38 pages, one figure. Some explanations, a figure, and an appendix added, a misprinted equation corrected, no changes of physical contents
发表信息：
Phys. Rev. D 95, 066008 (2017)
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摘要：

正则张量模型（CTM）是一个三秩张量模型，在正则形式主义中被表述为一个完全约束系统。CTM的约束代数具有与广义相对论的ADM形式类似的结构，并作为量子引力的离散模型进行研究。本文通过张量的四阶导数展开，在形式连续极限下分析了CTM的经典运动方程（EOM），并证明了它与由Hamilton-Jacobi方程导出的标量场和引力耦合系统的EOM是相同的。作用量包含一个指数形式的标量场势，并且系统经典地遵守一种对称性。我们发现，该系统有一个临界尺寸，由6，超过它变得不稳定，由于错误的标志的标量动力学项。在六维中，德西特时空成为了EOM的解，标志着共形对称的出现，而标度因子的时间演化在六维以下是幂律的。

英文摘要：

The canonical tensor model (CTM) is a rank-three tensor model formulated as a totally constrained system in the canonical formalism. The constraint algebra of CTM has a similar structure as that of the ADM formalism of general relativity, and is studied as a discretized model for quantum gravity. In this paper, we analyze the classical equation of motion (EOM) of CTM in a formal continuum limit through a derivative expansion of the tensor up to the forth order, and show that it is the same as the EOM of a coupled system of gravity and a scalar field derived from the Hamilton-Jacobi equation with an appropriate choice of an action. The action contains a scalar field potential of an exponential form, and the system classically respects a dilatational symmetry. We find that the system has a critical dimension, given by six, over which it becomes unstable due to the wrong sign of the scalar kinetic term. In six dimensions, de Sitter spacetime becomes a solution to the EOM, signaling the emergence of a conformal symmetry, while the time evolution of the scale factor is power-law in dimensions below six.

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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