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- W1536635055 abstract "In recent work, we showed that non-perturbative vacuum effects of a very low mass particle could induce, at a redshift of order 1, a transition from a matter-dominated to an accelerating universe. In that work, we used the simplification of a sudden transition out of the matter-dominated stage and were able to fit the type Ia supernovae (SNe-Ia) data points with a spatially open universe. In the present work, we find a more accurate, smooth spatially-flat analytic solution to the quantum-corrected Einstein equations. This solution gives a good fit to the SNe-Ia data with a particle mass parameter ${m}_{h}$ in the range $6.40ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}33} mathrm{eV}$ to $7.25ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}33} mathrm{eV}.$ It follows that the ratio of total matter density (including dark matter) to critical density, ${ensuremath{Omega}}_{0},$ is in the range 0.58 to 0.15, and the age ${t}_{0}$ of the universe is in the range ${8.10h}^{ensuremath{-}1}$ to ${12.2h}^{ensuremath{-}1} mathrm{Gyr},$ where h is the present value of the Hubble constant, measured as a fraction of the value $100 mathrm{km}/(mathrm{s} mathrm{Mpc}).$ This spatially-flat model agrees with estimates of the position of the first acoustic peak in the small angular scale fluctuations of the cosmic background radiation and with light-element abundances of standard big-bang nucleosynthesis. Our model has only a single free parameter, ${m}_{h},$ and does not require that we live at a special time in the evolution of the universe." @default.
- W1536635055 created "2016-06-24" @default.
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- W1536635055 date "1999-11-10" @default.
- W1536635055 modified "2023-10-16" @default.
- W1536635055 title "Vacuum effects of an ultralow mass particle account for the recent acceleration of the universe" @default.
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- W1536635055 doi "https://doi.org/10.1103/physrevd.60.123502" @default.
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