正则量子引力中背景独立性的一些令人惊讶的含义
Some surprising implications of background independence in canonical quantum gravity
摘要：
有一种精确的意义，即背景独立性的要求足以唯一地选择圈量子引力（LQG）的运动学。具体地说，LQG的基本运动代数承认一个唯一的同构不变状态。虽然这个结果已经被严格地建立起来，但对于研究量子引力的其他方法的研究人员来说，这是一个惊喜。这篇文章的目的是用几何动力学的教学方式来解释根本原因，保持最低限度的技术性。这一讨论将揭示出非微扰、正则量子引力中的量子态不变性（和协变性）所起的惊人的强大作用。
英文摘要：
There is a precise sense in which the requirement of background independence suffices to uniquely select the kinematics of loop quantum gravity (LQG). Specifically, the fundamental kinematic algebra of LQG admits a unique diffeomorphism invariant state. Although this result has been established rigorously, it comes as a surprise to researchers working with other approaches to quantum gravity. The goal of this article is to explain the underlying reasons in a pedagogical fashion using geometrodynamics, keeping the technicalities at their minimum. This discussion will bring out the surprisingly powerful role played by diffeomorphism invariance (and covariance) in non-perturbative, canonical quantum gravity.
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