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 to be a constant in each redshift bin. We consider four parametrizations of the equation of state for DE and find that is likely to cross the noninteracting () 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.
- Received 7 April 2010
DOI:https://doi.org/10.1103/PhysRevD.81.103514
©2010 American Physical Society