# 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…

## Figures from this paper

## 52 Citations

Stable and ‘bounded excursion’ gravastars, and black holes in Einstein’s theory of gravity

- Physics
- 2008

Dynamical models of prototype gravastars are constructed and studied. The models are the Visser–Wiltshire three-layer gravastars, in which an infinitely thin spherical shell of a perfect fluid with…

Gravastars or Black Holes as Consequence of Einstein’s Theory of Gravity

- Physics
- 2010

Dynamical models of prototype gravastars made of phantom energy are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state p = (1−γ)σ divides the whole…

Stable gravastars of anisotropic dark energy

- Physics
- 2008

Dynamical models of prototype gravastars made of anisotropic dark energy fluid are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state p = (1−γ)σ…

Stable gravastars of anisotropic dark energy

- Physics
- 2009

Dynamical models of prototype gravastars made of anisotropic dark energy fluid are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state p = (1−γ)σ…

Gravastars and black holes of anisotropic dark energy

- Physics
- 2011

Dynamical models of prototype gravastars made of anisotropic dark energy are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state p = (1 − γ)σ…

Gravastars with Dark Energy Evolving to Naked Singularity

- Physics
- 2011

We consider a gravastar model made of anisotropic dark energy with an infinitely thin spherical shell of a perfect fluid with the equation of state $p = (1-\gamma)\sigma$ with an external de…

Charged Gravastar in a Dark Energy Universe

- Physics
- 2013

Here we constructed a charged gravastar model formed by an interior de Sitter spacetime, a charged dynamical infinitely thin shell with an equation of state and an exterior de…

How the cosmological constant affects gravastar formation

- Physics
- 2009

Here we generalized a previous model of gravastar consisted of an internal de Sitter spacetime, a dynamical infinitely thin shell with an equation of state, but now we consider an external de…

Probing the stability of gravastars by dropping dust shells onto them

- Physics
- 2010

As a preparation for the dynamical investigations, this paper begins with a short review of the three-layer gravastar model with distinguished attention to the structure of the pertinent parameter…

Radiating Gravastars

- Physics
- 2011

Considering a Vaidya exterior spacetime, we study dynamical models of prototype gravastars, made of an infinitely thin spherical shell of a perfect fluid with the equation of state $p = \sigma$,…

## References

SHOWING 1-10 OF 50 REFERENCES

Stable gravastars—an alternative to black holes?

- Physics
- 2004

The 'gravastar' picture developed by Mazur and Mottola is one of a very small number of serious challenges to our usual conception of a 'black hole'. In the gravastar picture there is effectively a…

Gravastars must have anisotropic pressures

- Geology
- 2005

One of the very small number of serious alternatives to the usual concept of an astrophysical black hole is the ‘gravastar’ model developed by Mazur and Mottola, and a related phase-transition model…

Where are all the gravastars? Limits upon the gravastar model from accreting black holes

- Physics
- 2007

The gravastar model, which postulates a strongly correlated thin shell of anisotropic matter surrounding a region of anti-de Sitter space, has been proposed as an alternative to black holes. We…

Nonexistence of self-similar solutions containing a black hole in a universe with a stiff fluid or scalar field or quintessence

- Physics
- 2006

We consider the possible existence of self-similar solutions containing black holes in a Friedmann background with a stiff fluid or a scalar field. We carefully study the relationship between the…

Stable dark energy stars

- Physics
- 2006

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…

Gravitational vacuum condensate stars.

- PhysicsProceedings of the National Academy of Sciences of the United States of America
- 2004

A new final state of gravitational collapse is proposed, which has no singularities, no event horizons, and a global time and is thermodynamically stable and has no information paradox.

Gravastar solutions with continuous pressures and equation of state

- Physics
- 2005

We study the gravitational vacuum star (gravastar) configuration as proposed by Cattoen et al (2005 Class. Quantum Grav. 22 4189) in a model where the interior de Sitter spacetime segment is…

Gravastars supported by nonlinear electrodynamics

- Physics
- 2007

Gravastar models have recently been proposed as an alternative to black holes, mainly to avoid the problematic issues associated with event horizons and singularities. In this work, a wide variety of…

Gravitational condensate stars: An alternative to black holes

- Physics
- 2001

A new solution for the endpoint of gravitational collapse is proposed. By extending the concept of Bose-Einstein condensation to gravitational systems, a cold, compact object with an interior de…

Black hole formation from collapsing dust fluid in a background of dark energy

- Physics
- 2006

The gravitational collapse of a spherically symmetric star, made of a dust fluid, rho(DM), in a background of dark energy, p=w rho (w <-1/3) is studied. It is found that when only dark energy is…