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 \Omega _ { 0 } \approx 0.01 .
This number may be increased in models with more fields or extra dimensions .