Constant-density stars with a covariant anisotropic pressure equation of state admit ultracompact, horizonless GR solutions, regularized into gravastars by a thick shell.
Hence, the presence of the shell does not alter the Misner-Sharp mass of the object
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Ultracompact Anisotropic Stars and Gravastars in General Relativity
Constant-density stars with a covariant anisotropic pressure equation of state admit ultracompact, horizonless GR solutions, regularized into gravastars by a thick shell.