Dark Universe with Lagrange multipliers

Cosmological models with Lagrange multipliers are appealing because they could explain the behaviour of the dark sector in a unified way, in this sense dark matter and dark energy are two limits of a single fluid which describes the late behaviour of our universe at large scales. In this work we analyze extensions to the "Dust of Dark Energy model" proposed in JCAP 1005,012(2010) by including spatial curvature and more general potentials of the scalar field. We perform a dynamical system study and we present bayesian statistical analysis for the model using supernovae type Ia and H(z) data.