Regular Article - Theoretical Physics
Constraining the coupling constant between dark energy and dark matter
Center for Advanced Mathematics and Physics, National University of Sciences and Technology, Peshawar Road, Rawalpindi, 46000, Pakistan
* e-mail: email@example.com
Revised: 4 December 2008
Published online: 4 February 2009
We have investigated constraints on the coupling between dark matter and the interacting Chaplygin gas. Our results indicate that the coupling constant c between these two entities can take arbitrary values, which can be either positive or negative, thus giving arbitrary freedom to the inter-conversion between Chaplygin gas and dark matter. Thus, our results indicate that the restriction 0<c<1 on the coupling constant occurs as a very special case. Our analysis also supports the existence of phantom energy under certain conditions on the coupling constant.
© Springer-Verlag, 2009