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arXiv 0908.4224hep-thgr-qc
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随机量子化和时间在量子引力中的作用

Stochastic quantization and the role of time in quantum gravity

J. Ambjorn, R. Loll, W. Westra, S. Zohren

摘要:

我们表明,从二维量子引力的因果动力学三角形的框架内发展的非临界弦场论可以被看作是通过随机量子化。这就要求弦场论中出现的真时间与随机公式的随机时间相一致。随机量子化的框架产生了一个自然的非微扰量子哈密顿量,它包含了所有时空拓扑的总和。我们指出,随机时间的外部特征是一个更一般地与量子引力中非微扰关联函数中出现的真时或真距有关的特征。

英文摘要:

We show that the noncritical string field theory developed from two-dimensional quantum gravity in the framework of causal dynamical triangulations can be viewed as arising through a stochastic quantization. This requires that the proper time appearing in the string field theory be identified with the stochastic time of the stochastic formulation. The framework of stochastic quantization gives rise to a natural nonperturbative quantum Hamiltonian, which incorporates a sum over all spacetime topologies. We point out that the external character of stochastic time is a feature that pertains more generally to the proper time or distance appearing in nonperturbative correlation functions in quantum gravity.

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