| dc.description.abstract | In this paper we study a dark energy model taking into account a non-linear
interaction between the dark energy and dark matter components. The non-linear
interaction term, used in this work, is proportional to the square of dark energy density.
Considering a FRW type flat universe, we obtain an analytical expression for the Hubble
parameter H and from this quantity, the deceleration parameter q and the equation
of state parameter wΛ are analyzed. We found that, in this scenario, the accelerated
expansion regime of the universe in late times is possible. However, using suitable values
for the coupling constant, the square of the speed of sound remains negative, therefore,
the model is unstable under small perturbations. | |
