Dynamics, dynamic soft elasticity and rheology of smectic-C elastomers
  We present a theory for the low-frequency, long-wavelength dynamics of soft smectic-C elastomers with locked-in smectic layers. Our theory, which goes beyond pure hydrodynamics, predicts a dynamic soft elasticity of these elastomers and allows us to calculate the storage and loss moduli relevant for rheology experiments as well as the mode structure. 
Olaf Stenull and T. C. Lubensky