On Anisotropic Dark Energy

Abstract

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 $p=\omega \rho$, relating the pressure $p$ and the energy density $\rho$. The interval of the parameter $\omega$ defines the kind of matter of the universe, related to the fulfillment, or not, of the energy conditions of the fluid. The recent interest in this kind of fluid with anisotropic pressure, in the scenario of the gravitational collapse and star formation, imposes a carefull analysis of the energy conditions and the role of the components of the pressure. Here, in this work, we show an example where the classification of dark energy for isotropic pressure fluids is used incorrectly for anisotropic fluids. The correct classification and its consequences are presented.

15 pages, 1 figure, Abstract and Introduction changed, references added, corrected typos, accepted for publication in MPLA

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Cited by in corpus (22)

• Singularity-free solutions for anisotropic charged fluids with Chaplygin equation of state
• Charged gravastars admitting conformal motion
• Gravastar Shadows
• Charged gravastars in higher dimensions
• Gravastars with higher dimensional spacetimes
• The Dark Energy Star and Stability analysis
• Generic thin-shell gravastars
• Charged Gravastars with Conformal Motion in f(R,T) Gravity
• Dark Energy Stars with Phantom Field
• Gravastars and Black Holes of Anisotropic Dark Energy
• Kantowski-Sachs Universes sourced by a Skyrme fluid
• Anisotropic charged dark energy star
• Charged strange star coupled to anisotropic dark energy in Tolman-Kuchowicz spacetime
• Non-radial oscillations in anisotropic dark energy stars
• A new method for testing isotropy with Shannon entropy
• Vacuum solutions in the Einstein-Aether Theory
• Horizonless star based on regular black hole with finite radius and its observational signatures
• Gravitational Collapse of an Imperfect Non Adiabatic Fluid
• Kiselev Black Holes in Anti-de Sitter Spacetime Are Not Viable
• Radiant gravitational collapse with anisotropy in pressures and bulk viscosity
• Complete Classification of Analytical Models in Einstein-Aether Cosmology
• Comment to ''On Anisotropic Dark Energy Stars''