An isoperimetric inequality for a nonlinear eigenvalue problem
  We prove an isoperimetric inequality of the Rayleigh-Faber-Krahn type for a nonlinear generalization of the first twisted Dirichlet eigenvalue. More precisely, we show that the minimizer among sets of given volume is the union of two equal balls. 
Gisella Croce (LMAH), Antoine Henrot (IECN, INRIA Lorraine / IECN /   MMAS), Giovanni Pisante
math.AP