Nonsingular instantons for the creation of open universes

Abstract

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 constant in the action. This would make the instanton finite and free from any instabilities.

8 pages, RevTex. A new section on the instantonic global structure and a figure have been added. To appear in Phys. Rev. D

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Cited by in corpus (5)

• Instanton Cosmology and Domain Walls from M-theory and String Theory
• Open inflation from non-singular instantons: Wrapping the universe with a membrane
• Singular Instantons in Eddington-inspired-Born-Infeld Gravity
• Perdurance of multiply connected de Sitter space
• Action of Singular Instantons of Hawking-Turok Type