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2011

Bouncing models with a cosmological constant

Maier, Rodrigo, Pereira, Stella, Pinto-Neto, Nelson et al.

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Bouncing models have been proposed by many authors as a completion, or even as an alternative to inflation for the description of the very early and dense Universe.

However, most bouncing models contain a contracting phase from a very large and rarefied state, where dark energy might have had an important role as it has today in accelerating our large Universe.
In that case, its presence can modify the initial conditions and evolution of cosmological perturbations, changing the known results already obtained in the literature concerning their amplitude and spectrum.
In this paper, we assume the simplest and most appealing candidate for dark energy, the cosmological constant, and evaluate its influence on the evolution of cosmological perturbations during the contracting phase of a bouncing model, which also contains a scalar field with a potential allowing background solutions with pressure and energy density satisfying p = w*rho, w being a constant.

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