http://arxiv.org/abs/1508.07263
We show that a cosmology driven by gravitationally induced particle production of all non-relativistic species existing in the Universe mimics exactly the observed flat accelerating $\Lambda$CDM cosmology with just one dynamical free parameter. This kind of creation cold dark matter (CCDM) scenario provides a natural reduction of the dark sector since the vacuum component is not needed to accelerate the Universe. The new cosmic scenario is equivalent to $\Lambda$CDM both at the background and perturbative levels and is also in agreement with the universality of the gravitational interaction and equivalence principle. Implicitly, it suggests that the present day astronomical observations cannot be considered the ultimate proof of cosmic vacuum effects in the evolved Universe because $\Lambda$CDM may be only an effective cosmology
J. Lima, R. Santos and J. Cunha
Mon, 31 Aug 15
59/63
Comments: 5 pages, 2 figures
You must be logged in to post a comment.