Interacting model for the cosmological dark sector

We discuss a new interacting model for the cosmological dark sector in which the attenuated dilution of cold dark matter scales as a(-3)f(a), where f(a) is an arbitrary function of the cosmic scale factor a. From thermodynamic arguments, we show that f(a) is proportional to the entropy source of the particle creation process. In order to investigate the cosmological consequences of this kind of interacting models, we expand f(a) in a power series, and viable cosmological solutions are obtained. Finally, we use current observational data to place constraints on the interacting function f(a).

CNPq [305857/2010-0]

CNPq

FAPESP [2011/13018-0]

FAPESP

Department of Science and Technology (DST), Government of India

Department of Science and Technology (DST), Government of India [SR/S2/HEP-002/008]

FAPERJ

FAPERJ [E-26/103.239/2011]