Nontrivial Causal Structures Engendered by Knotted Solitons
  It is shown that the causal structure associated to string-like solutions of the Fadeev-Niemi (FN) model is described by an effective metric. Remarkably, the surfaces characterising the causal replacement depend on the energy momentum tensor of the background soliton and carry implicitly a topological invariant $\pi_{3}(\mathbb{S}^2)$. As a consequence, it follows that the pre- image curves in $\mathbb{R}^3$ nontrivialy define directions where the cones remain unchanged. It turns out that these results may be of importance in understanding time dependent solutions (collisions/scatterings) numerically or analytically. 
\'Erico Goulart
math-ph hep-th math.MP