Stable gravastars—an alternative to black holes?

By Matt Visser, D. Wiltshire. 2004

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Black holes in general relativity (2009, background): “jects where the core is de Sitter like, and the exterior is Schwarzschild like, and something odd has to happen in the region 2m=r . 1 where the horizon would otherwise have formed [42, 43]. See also [50, 51, 52]. In the region 2m=r . 1 various authors have argued for: Guaranteed anisotropies [49]; ”
Gravitational Condensate Stars: An Alternative to Black Holes (2001, unknown): “…with macroscopically large or ‘thick’ shells, comparable to the gravitational radius r M itself, with compactness GM / r differing from the maximal value of 1/2, by order unity, some time varying, or with timelike surfaces displaced from the Schwarzschild or dS horizons by ﬁnite amounts [47–63].”