Spectra of primordial fluctuations in two-perfect-fluid regular bounces

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dc.creatorFinelli, F.
dc.creatorPeter, P.
dc.creatorPinto-Neto, N.
dc.date2007-09-19
dc.date.accessioned2026-07-07T11:37:19Z
dc.date.available2026-07-07T11:37:19Z
dc.descriptionWe 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 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.
dc.description11 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0709.3074
dc.identifierhttp://arxiv.org/abs/0709.3074
dc.identifierPhys.Rev.D77:103508,2008
dc.identifierdoi:10.1103/PhysRevD.77.103508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199168
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleSpectra of primordial fluctuations in two-perfect-fluid regular bounces
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