Testing the interaction between dark energy and dark matter via the latest observations

Jian-Hua He, Bin Wang, and Elcio Abdalla
Phys. Rev. D 83, 063515 – Published 14 March 2011

Abstract

Cosmological analyses based on currently available observations are unable to rule out a sizeable coupling between dark energy and dark matter. However, the signature of the coupling is not easy to grasp, since the coupling is degenerate with other cosmological parameters, such as the dark energy equation of state and the dark matter abundance. We discuss possible ways to break such degeneracy. Based on the perturbation formalism, we carry out the global fitting by using the latest observational data and get a tight constraint on the interaction between dark sectors. We find that the appropriate interaction can alleviate the coincidence problem.

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  • Received 21 December 2010

DOI:https://doi.org/10.1103/PhysRevD.83.063515

© 2011 American Physical Society

Authors & Affiliations

Jian-Hua He and Bin Wang

  • Institute of Nuclear and Particle Physics, Astronomy, and Cosmology (INPAC) and the Department of Physics, Shanghai Jiao Tong University, 200240 Shanghai, China

Elcio Abdalla

  • Instituto de Física, Universidade de São Paulo, Caminho Particular 66318, 05315-970, São Paulo, Brazil

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Issue

Vol. 83, Iss. 6 — 15 March 2011

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