Even the Minkowski space is holed
arXiv:0903.3991 · doi:10.1103/PhysRevD.79.124041
Abstract
To cure the lack of predictive power of general relativity Geroch proposed to complete the theory with an additional postulate that only "hole-free" spacetimes are permitted. I argue that this postulate is too strong -- it prohibits even the Minkowski space.
Some clarifications are added on the relation of the counter-example to Geroch's proposal