منابع مشابه
Anisotropic dark energy stars
A model of compact object coupled to inhomogeneous anisotropic dark energy is studied. It is assumed a variable dark energy that suffers a phase transition at a critical density. The anisotropic Λ−Tolman-Oppenheimer-Volkoff equations are integrated to know the structure of these objects. The anisotropy is concentrated on a thin shell where the phase transition takes place, while the rest of the...
متن کاملOn Anisotropic Dark Energy Stars
Abstract Anisotropic pressure dark energy stars are recently proposed as an alternative model to gravastar. However, the nature’s classification of the fluid was based on the interval of the parameter ω, defined by the state equation that comes directly from the isotropic pressure Friedmann cosmological models. This procedure is not correct. In this work we propose a generalization of the limit...
متن کاملComment to “On Anisotropic Dark Energy Stars”
The authors of the paper “On Anisotropic Dark Energy Stars”, arXiv:0803.2508 [gr-qc], consider the equations of state pr = ωρ and pt = ωρ, ignoring the fact that this implies an isotropic pressure, which places strict restrictions on the values of ω. The authors then argue for an anisotropic pressure fluid throughout their work, and apply these equations of state to the energy conditions, conse...
متن کاملOn Anisotropic Dark Energy
Since the discovery of the accelerated expansion of the universe, it was necessary to introduce a new component of matter distribution called dark energy. The standard cosmological model considers isotropy of the pressure and assumes an equation of state p = ωρ, relating the pressure p and the energy density ρ. The interval of the parameter ω defines the kind of matter of the universe, related ...
متن کاملAnisotropic perturbations due to dark energy
A variety of observational tests seem to suggest that the universe is anisotropic. This is incompatible with the standard dogma based on adiabatic, rotationally invariant perturbations. We point out that this is a consequence of the standard decomposition of the stress-energy tensor for the cosmological fluids, and that rotational invariance need not be assumed, if there is elastic rigidity in ...
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ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 2011
ISSN: 0004-640X,1572-946X
DOI: 10.1007/s10509-011-0663-4