Giovanni Bellettini, Paolo Butta', Errico Presutti
Sharp interface limits for non local anisotropic interactions
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ABSTRACT.  We prove a convexity property of the surface tension of non local, 
anisotropic free energy functionals which implies that the Wulff
shape is strictly convex and smooth. We also prove that the transport 
coefficients of the limit anisotropic motion by mean curvature obtained
in [J. Stat. Phys. 87 (1997) 63--89] are strictly positive and equal to 
the stiffness parameters determined by the surface tension.