Quadratic interaction effect on the dark energy density in the universe

Deveci Derya G^{1, 2}, Aydiner Ekrem^{1, †}

(color online) (a) The effective equations of state (blue) and (red) versus x where x = ln(a/a₀) and (b) the density parameters of Ω_DE (blue) and Ω_k (red) versus x are represented for the flat universe b² = 0.2, for an interaction of n = 1 with the initial conditions Ω_DE(0) = 0.72, Ω_k(0) = 0.0 where k=0.