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arXiv 1111.2790hep-thgr-qc
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具有局部时的正则张量模型

Canonical tensor models with local time

Naoki Sasakura

摘要:

如何在时空的突现图景中引入局部时,这是一个有趣的问题。在本文中,这个问题是在张量模型的上下文中讨论。为了在张量模型中一致地引入局部时,本文提出了一种具有Hamilton形式的第一类约束的三秩张量模型。在通常的连续空间的极限中,约束代数再现了广义相对论的Hamilton形式。虽然动量约束可以通过张量模型的对称性很容易地实现,但哈密顿约束的形式受到整个约束代数封闭条件的强烈限制。因此,哈密顿约束已被确定的假设,他们是本地的,最立方的正则变量。这种哈密顿约束的形式与c < 1弦场论中的哈密顿量有相似之处,但在矢量或矩阵模型的框架下,似乎不可能实现这样的约束代数。相反,这些模型是相当有用的物质理论与张量模型相结合。在这个意义上,三指数张量是在张量模型中描述引力所必需的最小秩动力学变量。

英文摘要:

It is an intriguing question how local time can be introduced in the emergent picture of spacetime. In this paper, this problem is discussed in the context of tensor models. To consistently incorporate local time into tensor models, a rank- three tensor model with first class constraints in Hamilton formalism is presented. In the limit of usual continuous spaces, the algebra of constraints reproduces that of general relativity in Hamilton formalism. While the momentum constraints can be realized rather easily by the symmetry of the tensor models, the form of the Hamiltonian constraints is strongly limited by the condition of the closure of the whole constraint algebra. Thus the Hamiltonian constraints have been determined on the assumption that they are local and at most cubic in canonical variables. The form of the Hamiltonian constraints has similarity with the Hamiltonian in the c < 1 string field theory, but it seems impossible to realize such a constraint algebras in the framework of vector or matrix models. Instead these models are rather useful as matter theories coupled with the tensor model. In this sense, a three-index tensor is the minimum-rank dynamical variable necessary to describe gravity in terms of tensor models.

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