Open inflation from quantum cosmology with a strong nonminimal coupling

TL;DR

This paper introduces a quantum cosmology model for open inflation driven by a no-boundary wavefunction with strong nonminimal coupling, producing realistic inflation parameters without anthropic assumptions.

Contribution

It develops a slow roll perturbation expansion for the Hawking-Turok instanton in a nonminimal coupling model, linking quantum effects to observable open inflation.

Findings

Probability distribution peaks align with inflationary parameters

Open inflation can originate from the no-boundary wavefunction

Classical and quantum effects jointly determine inflation dynamics

Abstract

We propose the mechanism of quantum creation of the open Universe in the observable range of values of $\Omega$. This mechanism is based on the no-boundary quantum state with the Hawking-Turok instanton applied to the model with a strong nonminimal coupling of the inflaton field. We develop the slow roll perturbation expansion for the instanton solution and obtain a nontrivial contribution to the classical instanton action. The interplay of this classical contribution with the loop effects due to quantum effective action generates the probability distribution peak with necessary parameters of the inflation stage without invoking any anthropic considerations. In contrast with a similar mechanism for closed models, existing only for the tunneling quantum state of the Universe, the observationally justified open inflation originates from the no-boundary cosmological wavefunction.