  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.

High Energy Physics - Theory;Cosmology and Nongalactic Astrophysics;General Relativity and Quantum Cosmology