Dark matter from dark energy-baryonic matter couplings

Details Dark matter from dark energy-baryonic matter couplings Dark matter from dark energy-baryonic matter couplings

2010-12-15

arxiv.org/abs/1012.3203v2

Phys.Rev.D83:023510,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 8 figures, in this version small typos are corrected and it matches the published version in Phys. Rev. D15, January

Scientific paper

10.1103/PhysRevD.83.023510

We present a scenario in which a scalar field dark energy is coupled to the trace of the energy momentum tensor of the baryonic matter fields. In the slow-roll regime, this interaction could give rise to the cosmological features of dark matter. We work out the cosmological background solutions and fit the parameters of the model using the Union 2 supernovae data set. Then, we develop the cosmological perturbations up to linear order, and we find that the perturbed variables have an acceptable behavior, in particular the density contrast of baryonic matter grows similar to that in the $\Lambda$CDM model for a suitable choice of the strength parameter of the coupling.

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