tl;dr (emphasis added): "Solutions to this problem turn out to be mathematically equivalent to photon spheres around black holes in cosmology [...] As an appli

tl;dr (emphasis added): "Solutions to this problem turn out to be mathematically equivalent to photon spheres around black holes in cosmology [...] As an application, we uncover super-coherent material eddies in the South Atlantic ..." http://arxiv.org/abs/1308.2352 http://arxiv.org/abs/1308.2352 I'm not a physicist, but I interpret this to mean that it isn't an analogy of the gravitational pull of a black hole. Instead, the fluid motion around black holes and large oceanic eddies are mathematically similar.