Quintessence dissipative superattractor cosmology

We investigate the simplest quintessence dissipative dark matter attractor cosmology characterized by a constant quintessence baryotropic index and a power-law expansion. We show a class of accelerated coincidence-solving attractor solutions converging to this asymptotic behavior. Despite its simplicity, such a “superattractor” regime provides a model of the recent universe that also exhibits an excellent fit to supernovae luminosity observations and no age conflict. Our best fit gives $\alpha =1.71\mathrm{}\pm 0.29$ for the power-law exponent. We calculate for this regime the evolution of density and entropy perturbations.