Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-05-27
Class.Quant.Grav.22:4189-4202,2005
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
V1: 15 pages; 4 figures; uses iopart.cls; V2: 16 pages; added 3 references and brief discussion
Scientific paper
10.1088/0264-9381/22/20/002
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 due to Laughlin et al. We consider a generalized class of similar models that exhibit continuous pressure -- without the presence of infinitesimally thin shells. By considering the usual TOV equation for static solutions with negative central pressure, we find that gravastars cannot be perfect fluids -- anisotropic pressures in the "crust" of a gravastar-like object are unavoidable. The anisotropic TOV equation can then be used to bound the pressure anisotropy. The transverse stresses that support a gravastar permit a higher compactness than is given by the Buchdahl--Bondi bound for perfect fluid stars. Finally we comment on the qualitative features of the equation of state that gravastar material must have if it is to do the desired job of preventing horizon formation.
Cattoen Celine
Faber Tristan
Visser Matt
No associations
LandOfFree
Gravastars must have anisotropic pressures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Gravastars must have anisotropic pressures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gravastars must have anisotropic pressures will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-522683