Szekeres metrics with M < 0 imply negative dust density ρ under no-shell-crossing conditions, disqualifying them as cosmological models.
Hellaby, The nonsimultaneous nature of the SchwarzschildR= 0 singular- ity,J
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The Szekeres metrics with $M < 0$
Szekeres metrics with M < 0 imply negative dust density ρ under no-shell-crossing conditions, disqualifying them as cosmological models.