PREPRINT
140B8A4F-9438-4348-A711-7EB556C1F956

# Open Inflation Without False Vacua

S. W. Hawking, Neil Turok
arXiv:hep-th/9802030

Submitted on 5 February 1998

## Abstract

We show that within the framework of a definite proposal for the initial conditions for the universe, the Hartle-Hawking `no boundary' proposal, open inflation is generic and does not require any special properties of the inflaton potential. In the simplest inflationary models, the semiclassical approximation to the Euclidean path integral and a minimal anthropic condition lead to ${\mathrm{\Omega }}_{0}\approx 0.01$. This number may be increased in models with more fields or extra dimensions.

## Preprint

Comment: 10 pages, compressed and RevTex file with one postscript figure, openlet1.ps

Subjects: High Energy Physics - Theory; Astrophysics; General Relativity and Quantum Cosmology; High Energy Physics - Phenomenology