A Review of Derivations of the Space-Time Foam Formulas

Abstract

The space-time foam formulas, quoted below in Eqs (1) and (3), express the minimal amount of quantum uncertainty to be introduced into the structure of the Einsteinian space-time in order to make that structure compatible with quantum mechanics. In addition to their theoretical significance, the formulas lead to far reaching observable consequences shortly recalled below in the last section. The main purpose of the present note is the examination of the reliability and the comparison of various derivations of the said formulas.