This work explains how the presence of a Type-IV singularity (a mild singularity) can influence dynamics bouncing universe. In particular, we examine bounce cosmology that appears with in context ghost-free Gauss–Bonnet theory gravity. Depending on time occurrence singularity, three different cases may arise—when occurs before bounce, after or at instant bounce. However, all these cases, find c...

In this work, a regular black string solution is presented from the method used by Simpson–Visser to regularize Schwarzschild solution. As in new solution, it possible represent both hole and wormhole simply changing value of parameter “a” its metric. Tensors curvature invariants are analyzed verify regularity as well energy conditions system. It found that null condition always violated for en...