Masking singularities in Weyl gravity and Ricci flows

Understand

Within vacuum Weyl gravity, we obtain a solution by which, using different choices of the conformal factor, we derive metrics describing (i)~a bounce of the universe; (ii)~toroidal and spherical wormholes; and (iii)~a change in metric signature.

• It is demonstrated that singularities occurring in these systems are "masked".
• We give a simple explanation of the possibility of masking the singularities within Weyl gravity.
• It is shown that in the first and third cases the three-dimensional metrics form Ricci flows.