01/04/2009 – 14h – Auditório Principal, Bloco G – IAG/USP

Ana Pelinson

Depto. de Astronomia, IAG/USP

Título/Title: Dark energy perturbations and cosmic coincidence

Resumo/Abstract:

I am going to present some general properties of the simultaneous set of matter and dark energy (DE) perturbations for a multicomponent DE fluid. Using these properties, I will present the test of a non-trivial model of dynamical DE, the LambdaXCDM model, which was suggested as a solution to the "cosmic coincidence problem". By requiring that the matter power spectrum is consistent with the 2dFGRS data it is possible to determine a strong limited region of the 3D parameter space where the model can also solve the cosmic coincidence problem, where the "coincidence ratio" stays bounded during the entire history of the Universe.

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