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Nonbaryonic dark matter and scalar field coupled with a transversal interaction plus decoupled radiation

  • Luis P. Chimento
  • Martín G. Richarte
Regular Article - Theoretical Physics

Abstract

We analyze a universe filled with interacting dark matter, a scalar field accommodated as dark radiation along with dark energy plus a decoupled radiation term within the framework of the spatially flat Friedmann–Robertson–Walker (FRW) spacetime. We work in a three-dimensional internal space spanned by the interaction vector and use a transversal interaction Q t for solving the source equation in order to find all the interacting component energy densities. We asymptotically reconstruct the scalar field and potential from an early radiation era to the late dominate dark energy one, passing through an intermediate epoch dominated by dark matter. We apply the χ 2 method to the updated observational Hubble data for constraining the cosmic parameters, contrast with the Union 2 sample of supernovae, and analyze the amount of dark energy in the radiation era. It turns out that our model fulfills the severe bound of Ω ϕ (z≃1100)<0.018 at 2σ level, is consistent with the recent analysis that includes cosmic microwave background anisotropy measurements from the Atacama Cosmology Telescope and the South Pole Telescope along with the future constraints achievable by Planck and CMBPol experiments, and satisfies the stringent bound Ω ϕ (z≃1010)<0.04 at 2σ level in the big-bang nucleosynthesis epoch.

Keywords

Dark Matter Dark Energy Scalar Field Cosmic Microwave Background Dark Sector 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful to the referee for his careful reading of the manuscript and for making useful suggestions, which helped to improve the article. L.P.C. thanks the University of Buenos Aires under Project No. 20020100100147 and the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) under Project PIP 114-200801-00328 for the partial support of this work during their different stages. M.G.R. is partially supported by Postdoctoral Fellowship program of CONICET.

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Copyright information

© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica 2013

Authors and Affiliations

  1. 1.Departamento de Física, Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos Aires and IFIBA, CONICETBuenos AiresArgentina

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