Spectral asymptotics for a singularly perturbed fourth order locally   periodic self-adjoint elliptic operator
  We consider the homogenization of a singularly perturbed self-adjoint fourth order elliptic equation with locally periodic coefficients, stated in a bounded domain. We impose Dirichlet boundary conditions on the boundary of the domain. The presence of large parameters in the lower order terms and the dependence of the coefficients on the slow variable give rise to the effect of localization of the eigenfunctions. We show that the $j$th eigenfunction can be approximated by a rescaled function that is constructed in terms of the $j$th eigenfunction of fourth or second order order effective operators with constant coefficients, depending on the large parameters. 
Alexandra Chechkina, Irina Pankratova, Klas Pettersson
math.AP math-ph math.MP math.SP