Cosmology with Ricci-type dark energy
Abstract
We consider the dynamics of a cosmological substratum of pressureless matter and holographic dark energy with a cutoff length proportional to the Ricci scale. Stability requirements for the matter perturbations are shown to single out a model with a fixed relation between the present matter fraction m0 and the present value ω0 of the equation-of-state parameter of the dark energy. This model has the same number of free parameters as the model but it has no limit. We discuss the consistency between background observations and the mentioned stability-guaranteeing parameter combination.
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