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A simple model of a black-hole interior

A simple model of a " black hole interior " , namely a spherically symmetric solution of the Einstein field equations in matter matching the Schwarzschild vacuum at a spacelike hypersurface " R < 2M " is constructed. The model is physically valid: it describes an elastic–solid sphere having a well–defined equation of state and satisfying the weak energy condition. G. Magli, A simple model of a black hole interior