Phys. Rev. D 59, 043509 (1999) [7 pages]Nonsingular instantons for the creation of open universesReceived 4 May 1998; revised 18 August 1998; published 21 January 1999 We show that the instability of the singular Vilenkin instanton describing the creation of an open universe can be avoided using, instead of a minimally coupled scalar field, an axionic massless scalar field which gives rise to the Giddings-Strominger instanton. However, if we replace the singularity of the Hawking-Turok instanton for an axionic wormhole some interpretational and technical difficulties would appear which can be overcome by introducing a positive cosmological constant in the action. This would make the instanton finite and free from any instabilities. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.59.043509
DOI:
10.1103/PhysRevD.59.043509
PACS:
98.80.Cq, 04.60.-m
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