Crossing the phantom divide with Ricci-like holographic dark energy
Instituto de Física, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Casilla, 4059, Valparaíso, Chile
2 Departamento de Ciencias Físicas, Facultad de Ingeniería, Ciencias y Administración, Universidad de La Frontera, Casilla 54-D, Temuco, Chile
Revised: 5 August 2010
Published online: 31 August 2010
In this work we study the dark energy problem by adopting an holographic model proposed recently in the literature. In this model there has been postulated an energy density ρ∼R, where R is the Ricci scalar curvature. Under this consideration, we have obtained a cosmological scenario which arises from considering two non-interacting fluids along the lines of a reasonable Ansatz for the cosmic coincidence parameter. We have adjusted the involved parameters in the model according to the observational data, showing that the equation of state for the dark energy exhibits a cross through the −1 barrier. Additionally, we have found a disagreement of these parameters in comparison with a scalar field theory approach.
© Springer-Verlag / Società Italiana di Fisica, 2010