Persistence of translational symmetry in the BCS model with radial pair   interaction
  We consider the two-dimensional BCS functional with a radial pair interaction. We show that the translational symmetry is not broken in a certain temperature interval below the critical temperature. In the case of vanishing angular momentum our results carry over to the three-dimensional case. 
Andreas Deuchert, Alissa Geisinger, Christian Hainzl and Michael Loss
math-ph cond-mat.supr-con math.MP