A diffuse-interface theory for active nematic-isotropic interfaces derives a reduced model where activity adds a local q² term to the height mode that competes with passive capillary relaxation at q⁴.
For a long-wavelength displacement, the lead- ing composition perturbation is δφ(x,y,t ) = −h(x,t )φ ′ 0(y), (C5) up to the sign convention used in the definition of the height mode
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A diffuse-interface theory of active nematic interfaces: transport mechanisms and modal structure
A diffuse-interface theory for active nematic-isotropic interfaces derives a reduced model where activity adds a local q² term to the height mode that competes with passive capillary relaxation at q⁴.