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Gravastar Solutions with Continuous Pressures and Equation of State

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arxiv gr-qc/0511097 v3 pith:NETIRVZ2 submitted 2005-11-17 gr-qc astro-phhep-th

A. DeBenedictis , D. Horvat , S. Ilijic , S. Kloster , K. S. Viswanathan This is my paper · ORCID
classification gr-qcastro-phhep-th
keywords equationgravastarstatebeenconditionscontinuousenergyfluid
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abstract

We study the gravitational vacuum star (gravastar) configuration as proposed by other authors in a model where the interior de Sitter spacetime segment is continuously extended to the exterior Schwarzschild spacetime. The multilayered structure in previous papers is replaced by a continuous stress-energy tensor at the price of introducing anisotropy in the (fluid) model of the gravastar. Either with an ansatz for the equation of state connecting the radial $p_r$ and tangential $p_t$ pressure or with a calculated equation of state with non-homogeneous energy/fluid density, solutions are obtained which in all aspects satisfy the conditions expected for an anisotropic gravastar. Certain energy conditions have been shown to be obeyed and a polytropic equation of state has been derived. Stability of the solution with respect to possible axial perturbation is shown to hold.

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Cited by 2 Pith papers

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