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2009

CDM Accelerating Cosmology as an Alternative to LCDM model

Lima, J. A. S., Jesus, J. F., Oliveira, F. A.

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A new accelerating cosmology driven only by baryons plus cold dark matter (CDM) is proposed in the framework of general relativity.

In this model the present accelerating stage of the Universe is powered by the negative pressure describing the gravitationally-induced particle production of cold dark matter particles.
This kind of scenario has only one free parameter and the differential equation governing the evolution of the scale factor is exactly the same of the $\Lambda$CDM model.
For a spatially flat Universe, as predicted by inflation ($\Omega_{dm}+\Omega_{baryon}=1$), it is found that the effectively observed matter density parameter is $\Omega_{meff} = 1- \alpha$, where $\alpha$ is the constant parameter specifying the CDM particle creation rate.

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