In physics, the Planck length, denoted P, is a unit of length, equal to 1.616199(97)×10−35 metres. It is a base unit in the system of Planck units. The Planck length can be defined from three fundamental physical constants: the speed of light in a vacuum, Planck’s constant, and the gravitational constant.

arXiv 上有个介绍性文章：Quantum gravity and minimum length

This paper has a followup: Quantum Quandaries:A Category-Theoretic Perspective                                |

This paper is a followup to Higher-Dimensional Algebra and Planck-Scale Physics.  >——|