Scalar suppression on large scales in open inflation

TL;DR

This paper explores toy models of open inflation that can suppress large-scale scalar power while remaining consistent with observational constraints on spatial curvature, emphasizing the importance of quantum tunnelling effects for accurate predictions.

Contribution

It introduces two toy models of open inflation demonstrating large-scale scalar suppression compatible with curvature constraints, highlighting quantum tunnelling effects for precise modeling.

Findings

Both models can suppress large-scale scalar power.

Quantum tunnelling effects are crucial for accurate predictions.

Models satisfy observational constraints on spatial curvature.

Abstract

We consider two toy models of open inflation and investigate their ability to give a suppression of scalar power on large scales whilst also satisfying observational constraints on the spatial curvature of the universe. Qualitatively we find that both models are indeed capable of fulfilling these two requirements, but we also see that effects of the quantum tunnelling must be carefully taken into account if we wish to make quantitative predictions.