Uncertainty relation for quantum gravity

Abstract

Discussion of physical realization of coordinates demonstrates that the quantum theory of gravity (still absent) should be non-local and, probably, non-commutative as well.

Comments: Based on the talk at the 4th V.N. Gribov Memorial Workshop (gribov85), June, 17-20, 2015, Chernogolovka, Russia. To be published in Proceedings. v2: corrected title of the Workshop