Conformal Universe as false vacuum decay
M. Libanov, V. Rubakov

TL;DR
This paper proposes that the (pseudo-)conformal Universe scenario can be modeled as a false vacuum decay process, where a metastable conformal vacuum transitions via bubble nucleation, producing perturbations similar to those in traditional models.
Contribution
It introduces a new interpretation of the conformal Universe scenario as a false vacuum decay, linking bubble nucleation to cosmological perturbations.
Findings
Perturbations around the bubble match those in homogeneously rolling models.
Spectator field perturbations have a flat power spectrum.
Late-time properties of perturbations are consistent with original models.
Abstract
We point out that the (pseudo-)conformal Universe scenario may be realized as decay of conformally invariant, metastable vacuum, which proceeds via spontaneous nucleation and subsequent growth of a bubble of a putative new phase. We study perturbations about the bubble and show that their leading late-time properties coincide with those inherent in the original models with homogeneously rolling backgrounds. In particular, the perturbations of a spectator dimension-zero field have flat power spectrum.
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