Coupling of Smectic Order with Director Fluctuations

5 Coupling of Smectic Order with Director Fluctuations 

In a smectic A phase, in addition to the nematic elastic free energy density /, the smectic (/g) and the nematic-smectic interaction (//) terms are needed [6.28]  

The damping time constants corresponding to the above ( na( ) are given by 

A more concise treatment requires integration from min, which is given by the inverse dimension of a uniformly oriented sample, to Qc. However, the finite limits influence the result only at very low and very high Lar-mor frequencies. The integration over q space can be carried out as in Eq. (6.51), but is partly performed for the deformation modes with a = 1 and 

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