Journal
MODERN PHYSICS LETTERS A
Volume 24, Issue 14, Pages 1137-1146Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732309028692
Keywords
Dark energy; anisotropic
Categories
Funding
- CNPq (JFVR)
- FAPERJ/UERJ (MFAdaS)
- FAPERJ [E-26/171.754/2000, E-26/171.533/2002, E26/170.951/2006]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico -CNPq-Brazil
- Financiadora de Estudose Projetos [FINEP-Brazil(Ref.2399/03)]
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Since the discovery of 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 careful 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 in correctly for anisotropic fluids. The correct classification and its consequences are presented.
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