The paper argues that Gauss-Bonnet terms weaken the FLRW singularity to a sudden, traversable one and make radial black-hole geodesics only weakly singular, but internal sign and branch errors undermine both arguments.
Awad, Physical Review D87, 10.1103/physrevd.87.103001 (2013)
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Gauss-Bonnet Gravity and Spacetime Singularities
The paper argues that Gauss-Bonnet terms weaken the FLRW singularity to a sudden, traversable one and make radial black-hole geodesics only weakly singular, but internal sign and branch errors undermine both arguments.