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• W2078906532 abstract "We introduce analytic solutions for a class of two components bouncing models, where the bounce is triggered by a negative energy density perfect fluid. The equation of state of the two components are constant in time, but otherwise unrelated. By numerically integrating regular equations for scalar cosmological perturbations, we find that the (would-be) growing mode of the Newtonian potential before the bounce never matches with the growing mode in the expanding stage. For the particular case of a negative energy density component with a stiff equation of state we give a detailed analytic study, which is in complete agreement with the numerical results. We also perform analytic and numerical calculations for long wavelength tensor perturbations, obtaining that, in most cases of interest, the tensor spectral index is independent of the negative energy fluid and given by the spectral index of the growing mode in the contracting stage. We compare our results with previous investigations in the literature." @default.
• W2078906532 created "2016-06-24" @default.
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• W2078906532 date "2008-05-12" @default.
• W2078906532 modified "2023-09-27" @default.
• W2078906532 title "Spectra of primordial fluctuations in two-perfect-fluid regular bounces" @default.
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• W2078906532 doi "https://doi.org/10.1103/physrevd.77.103508" @default.
• W2078906532 hasPublicationYear "2008" @default.
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