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arxiv: hep-th/9802030 · v1 · submitted 1998-02-05 · ✦ hep-th · astro-ph· gr-qc· hep-ph

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Open Inflation Without False Vacua

S.W. Hawking , Neil Turok
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classification ✦ hep-th astro-phgr-qchep-ph
keywords inflationmodelsopenproposalanthropicapproxapproximationboundary
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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.

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  1. Inflation from a Weyl-flat null origin

    hep-ph 2026-04 unverdicted novelty 5.0

    Single-field inflation with ε(N) approaching a constant in (0,1) at early times forms an asymptotic universality class with a Weyl-flat null origin while producing ns and r values compatible with Planck data.