Diffusion on the Distorted Fermi Surface
  The diffusion approximation to the relaxation on the distorted Fermi surface in a Fermi liquid is considered. The dependence of the relaxation time on the multipolarity of a Fermi surface deformation is established. The time evolution of the non-equilibrium particle-hole excitations is studied. 
V.M. Kolomietz, S.V. Lukyanov
nucl-th