We calculate the power spectrum of adiabatic density perturbations in an open inflationary model in which inflation occurs in two stages. First an epoch of old inflation creates a large, smooth universe, solving the horizon and homogeneity problems. Then an open universe emerges through the nucleation of a single bubble, with constant density hypersurfaces inside the bubble having constant negative spatial curvature. An epoch of ``slow roll'' inflation, shortened to give Ω₀1 today, occurs within the bubble, which contains our entire observable universe. In this paper we compute the resulting density perturbations in the same ``new thin wall'' approximation used in a previous paper, but for an arbitrary positive mass of the inflaton field in the false vacuum satisfying m²/H²{≥}2 where H is the Hubble constant during old inflation.
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Bucher et al. (1995) studied this question.
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