Interacting dark energy: A generalized scenario and observational constraints

摘要

A generalized scenario, which is used to characterize the attenuated dilution of cold dark matter deviating from the standard case, is proposed for the interaction of cosmological dark sectors. This generalized framework cannot only fully recover the three frequently studied phenomenological parameterizations in the limit of the characteristic parameter α~→-1,0 and +1, but also admits a much wider range of cosmological solutions for other values of α. Moreover, some cosmological consequences are examined by placing constraints on this generalized interacting model with current observational data. We find that, for α in the extended range of [-1.0, 1.0], the case in which the energy flow transfers from dark matter to dark energy is slightly favored by observations.