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VOLUME 48 (1988) | ISSUE 6 | PAGE 297
Gravitational instantons and the branching off of the expanding universe
A model of a gravitational field which interacts with the fields of matter was used to find the instanton which describes the branching off from a flat universe of a little, closed universe which subsequently expands classically under inflationary conditions. The existence of such instantons raises the possibility of self-nucleation of systems of expanding universes.