Generalized models of unification of dark matter and dark energy

Abstract

A model of unification of dark matter and dark energy based on the modeling of the speed of sound as a function of the parameter of the equation of state is introduced. It is found that the model in which the speed of sound depends on the power of the parameter of the equation of state, $c_s^2=\alpha (-w{)}^{\gamma }$, contains the generalized Chaplygin gas models as its subclass. An effective scalar field description of the model is obtained in a parametric form which in some cases can be translated into a closed form solution for the scalar field potential. A constraint on model parameters is obtained using the observational data on the Hubble parameter at different redshifts.

arXiv commentv1: 18 pages, 6 figures; v2: 19 pages, minor changes, references added; v3: version published in PRD

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• Fate of an Accretion Disc around a Black Hole when both the Viscosity and Dark Energy is Effecting
• Transient dark energy, cosmological constant boundary crossing and dark energy $w(z)$ data fits
• Dark matter fluid constraints from galaxy rotation curves