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arXiv 0906.3547gr-qchep-thmath-phmath.MP
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2+1维量子引力的基本离散性研究

In Search of Fundamental Discreteness in 2+1 Dimensional Quantum Gravity

T. G. Budd, R. Loll

摘要:

受2+1维量子引力的启发,我们重新研究了纯洛伦兹引力的情况下,消失的宇宙学常数和空间紧凑的宇宙的亏格大于1的时间离散化的证据。作为我们的出发点的陈-西蒙斯公式与庞加莱规范群,我们确定了一组长度变量对应的空间和类时距离沿测地线在三维闵可夫斯基空间。这些是狄拉克观测量,即约化相空间上的函数,其量子化本质上是唯一的。对于类空距离算子和类时距离算子,谱是连续的,并且不远离零。

英文摘要:

Inspired by previous work in 2+1 dimensional quantum gravity, which found evidence for a discretization of time in the quantum theory, we reexamine the issue for the case of pure Lorentzian gravity with vanishing cosmological constant and spatially compact universes of genus larger than 1. Taking as our starting point the Chern-Simons formulation with Poincare gauge group, we identify a set of length variables corresponding to space- and timelike distances along geodesics in three-dimensional Minkowski space. These are Dirac observables, that is, functions on the reduced phase space, whose quantization is essentially unique. For both space- and timelike distance operators, the spectrum is continuous and not bounded away from zero.

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