Stable dark energy stars

By Francisco S. N. Lobo. 2005

321 citations recorded by the source corpus.

The gravastar picture is an alternative model to the concept of a black hole, where there is an effective phase transition at or near where the event horizon is expected to form, and the interior is replaced by a de Sitter condensate. In this work a generalization of the gravastar picture is explored by considering matching of an interior solution governed by the dark energy equation of state, ω ≡ p/ρ < −1/3, to an exterior Schwarzschild vacuum solution at a junction interface. The motivation for implementing this generalization arises from the fact that recent observations have confirmed an accelerated cosmic expansion, for which dark energy is a possible candidate. Several relativistic dark energy stellar configurations are analysed by imposing specific choices for the mass function. The first case considered is that of a constant energy density, and the second choice that of a monotonic decreasing energy density in the star's interior. The dynamical stability of the transition layer of these dark energy stars to linearized spherically symmetric radial perturbations about static equilibrium solutions is also explored. It is found that large stability regions exist that are sufficiently close to where the event horizon is expected to form, so that it would be difficult to distinguish the exterior geometry of the dark energy stars, analysed in this work, from an astrophysical black hole.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/ec0ebbaf90a8df8849fcb8d5b0939203bf68868d

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In Astronomy and Astrophysics

Citations in the corpus

Approximate Universal Relations for Neutron Stars and Quark Stars (2016, background): “interesting to study the I-Love-Q relations for other gravastar models, such as those with a finite-thickness boundary layer [359, 368], with the interior region supported by dark energy instead of a cosmological constant (phantom gravastars or dark energy stars) [379, 380].”
Exotic solutions in General Relativity: Traversable wormholes and 'warp drive' spacetimes (2007, background): “It was found that the latter may be significantly increased by considering appropriate choices for the redshift function (The linearized stability analysis was also applied to dark energy stars [211]).”
How to tell a gravastar from a black hole (2007, methodology): “Th is stability was generalized by Carter [6] for gravastar models with different exteriors . Other possibilities for the interior solution have also been considered: Bili´ c et al [7] replaced the de-Sitter interior by a Born-Infeld phantom, while Lobo replaced the interior solution by one that is ”
Regular Black Holes with Asymptotically Minkowski Cores (2019, background): “[3–7]) regular black holes, but also the Mazur–Mottola gravastars [8–16], and Dymnikova’s models [17–21].”
A class of relativistic stars with a linear equation of state (2007, methodology): “It is important to note that the mass function chosen is similar to the profile that appears in the modelling of dark energy stars (Lobo 2006).”
Black holes in general relativity (2009, background): “jects where the core is de Sitter like, and the exterior is Schwarzschild like, and something odd has to happen in the region 2m=r . 1 where the horizon would otherwise have formed [42, 43]. See also [50, 51, 52]. In the region 2m=r . 1 various authors have argued for: Guaranteed anisotropies [49]; ”