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- W2402401220 abstract "If the present universe is slightly open then pre-inflation curvature would appear as a cosmic dark-flow component of the CMB dipole moment. We summarize current cosmological constraints on this cosmic dark flow and analyze the possible constraints on parameters characterizing the pre-inflating universe in an inflation model with a present-day very slightly open ΛCDM cosmology. We employ an analytic model to show that for a broad class of inflation-generating effective potentials, the simple requirement that the observed dipole moment represents the pre-inflation curvature as it enters the horizon allows one to set upper and lower limits on the magnitude and wavelength scale of pre-inflation fluctuations in the inflaton field and the curvature parameter of the pre-inflation universe, as a function of the fraction of the total initial energy density in the inflaton field. We estimate that if the current CMB dipole is a universal dark flow (or if it is near the upper limit set by the Planck Collaboration) then the present constraints on ΛCDM cosmological parameters imply rather small curvature Ω k ~ 0:1 for the pre-inflating universe for a broad range of the fraction of the total energy in the inflaton field at the onset of inflation. Such small pre-inflation curvature might be indicative of open-inflation models in which there are two epochs of inflation." @default.
- W2402401220 created "2016-06-24" @default.
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- W2402401220 date "2015-09-30" @default.
- W2402401220 modified "2023-10-16" @default.
- W2402401220 title "CONSTRAINTS ON PRE-INFLATION COSMOLOGY AND DARK FLOW" @default.
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- W2402401220 doi "https://doi.org/10.5303/pkas.2015.30.2.309" @default.
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