A new covariant formulation of radial perturbations for imperfect fluids in GR yields a causality-imposed upper bound on the compactness of stable anisotropic stars.
Covariant perturbations of Schwarzschild black holes
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Radial adiabatic perturbations of stellar compact objects
A new covariant formulation of radial perturbations for imperfect fluids in GR yields a causality-imposed upper bound on the compactness of stable anisotropic stars.