Nonsingular instantons for the creation of open universes

Details Nonsingular instantons for the creation of open universes Nonsingular instantons for the creation of open universes

1998-05-04

arxiv.org/abs/hep-th/9805012v2

Phys.Rev. D59 (1999) 043509

Physics

High Energy Physics

High Energy Physics - Theory

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

Scientific paper

10.1103/PhysRevD.59.043509

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.

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