Gravastars must have anisotropic pressures

  title={Gravastars must have anisotropic pressures},
  author={Celine Cattoen and Tristan Faber and Matt Visser},
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… CONTINUE READING