Bounded excursion stable gravastars and black holes

@article{Rocha2008BoundedES,
  title={Bounded excursion stable gravastars and black holes},
  author={P. Rocha and Alexandre Yasuda Miguelote and R. Chan and M F A da Silva and N O Santos and Anzhong Wang},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2008},
  volume={2008},
  pages={025}
}
Dynamical models of prototype gravastars were constructed in order to study their stability. The models are the Visser–Wiltshire three-layer gravastars, in which an infinitely thin spherical shell of stiff fluid divides the whole spacetime into two regions, where the internal region is de Sitter, and the external one is Schwarzschild. It is found that in some cases the models represent the ‘bounded excursion’ stable gravastars, where the thin shell is oscillating between two finite radii, while… 
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