Comment on “Strength and genericity of singularities in Tolman–Bondi–de Sitter collapse” and a note on central singularities

Abstract

It has been claimed in Phys. Lett. A 287 (2001) 53 that the Lemaitre–Tolman–Bondi–de Sitter solution always admits future-pointing radial time-like geodesics emerging from the shell-focussing singularity, regardless of the nature of the (regular) initial data. This is despite the fact that some data rule out the emergence of future pointing radial null geodesics. We correct this claim and show that, in general in spherical symmetry, the absence of radial null geodesics emerging from a central singularity is sufficient to prove that the singularity is censored.