Finite time singularities for water waves with surface tension
  Here we consider the 2D free boundary incompressible Euler equation with surface tension. We prove that the surface tension does not prevent a finite time splash or splat singularity, i.e. that the curve touches itself either in a point or along an arc. To do so, the main ingredients of the proof are a transformation to desingularize the curve and a priori energy estimates. 
Angel Castro, Diego C\'ordoba, Charles Fefferman, Francisco Gancedo,   Javier G\'omez-Serrano
math.AP