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arXiv 1506.04872hep-thgr-qc
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从正则张量模型的形式连续极限导出广义相对论的约束代数

Constraint algebra of general relativity from a formal continuum limit of canonical tensor model

Naoki Sasakura, Yuki Sato

摘要:

正则张量模型(Canonical tensor model,以下简称CTM)是一种在正则形式下表示为完全约束系统的三秩张量模型。在经典情形下,这些约束形成了一个第一类约束泊松代数,其结构类似于广义相对论的ADM形式,从而使CTM成为量子引力的一种可能的离散形式。本文证明了在形式连续极限下,CTM的约束Poisson代数不含宇宙学常数,精确地再现了ADM形式的约束Poisson代数。为此,我们得到了广义相对论中度规张量场用CTM中的一个动力学三秩张量表示的表达式,并确定了CTM的约束条件与ADM形式的约束条件之间的对应关系.另一方面,CTM的宇宙学常数项似乎诱导了非定域动力学,并且与关于连续极限的定域性假设不一致。

英文摘要:

Canonical tensor model (CTM for short below) is a rank-three tensor model formulated as a totally constrained system in the canonical formalism. In the classical case, the constraints form a first-class constraint Poisson algebra with structures similar to that of the ADM formalism of general relativity, qualifying CTM as a possible discrete formalism for quantum gravity. In this paper, we show that, in a formal continuum limit, the constraint Poisson algebra of CTM with no cosmological constant exactly reproduces that of the ADM formalism. To this end, we obtain the expression of the metric tensor field in general relativity in terms of one of the dynamical rank-three tensors in CTM, and determine the correspondence between the constraints of CTM and those of the ADM formalism. On the other hand, the cosmological constant term of CTM seems to induce non-local dynamics, and is inconsistent with an assumption about locality of the continuum limit.

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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