Year: 2010
Type: article
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 $\ensuremath{\delta}(z)$ to be a constant in each redshift bin. We consider four parametrizations of the equation of state ${w}_{de}$ for DE and find that $\ensuremath{\delta}(z)$ is likely to cross the noninteracting ($\ensuremath{\delta}=0$) 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.
Authors: Rong-Gen Cai, Qiping Su
Institutions: Chinese Academy of Sciences, Institute of Theoretical Physics
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2068373320