On the dark sector interactions

Rong-Gen Cai and Qiping Su
Phys. Rev. D 81, 103514 – Published 10 May 2010

Abstract

It is possible that there exist some interactions between dark energy (DE) and dark matter (DM), and a suitable interaction can alleviate the coincidence problem. Several phenomenological interacting forms are proposed and are fitted with observations in the literature. In this paper we investigate the possible interaction in a way independent of specific interacting forms by the use of observational data (supernovae, BAO, CMB, and Hubble parameter). We divide the whole range of redshift into a few bins and set the interacting term δ(z) to be a constant in each redshift bin. We consider four parametrizations of the equation of state wde for DE and find that δ(z) is likely to cross the noninteracting (δ=0) and have an oscillation form. It suggests that to study the interaction between DE and DM, more general phenomenological forms of the interacting term should be considered.

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  • Received 7 April 2010

DOI:https://doi.org/10.1103/PhysRevD.81.103514

©2010 American Physical Society

Authors & Affiliations

Rong-Gen Cai* and Qiping Su

  • Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China

  • *cairg@itp.ac.cn
  • sqp@itp.ac.cn

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Vol. 81, Iss. 10 — 15 May 2010

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