Non-Commutative Space-Times, Black Hole, and Elementary Particle

Abstract

It is shown that elementary black hole can not be distinguished from an elementary particle in the non-commutative space-times (space/space and space/time) at the Planck scale. But, the non-commutative space-times can not be ``directly'' measured in the elementary black hole system. A time-varying non-commutative parameter $θ(t)$ is suggested in accordance with the time-varying-G scenario. By identifying the elementary black hole with an elementary particle, the large hierarchy between the weak scale and Planck scale is naturally understood. For large black hole, the discrete spectrum of the horizon area is derived by identifying the black hole horizon with a non-commutative sphere.