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Time dependent Ginzburg - Landau model in the absence of translational invariance. Non-conserved order parameter domain growth

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Published under licence by IOP Publishing Ltd
, , Citation Umberto Marini Bettolo Marconi and Alberto Petri 1997 J. Phys. A: Math. Gen. 30 1069 DOI 10.1088/0305-4470/30/4/010

0305-4470/30/4/1069

Abstract

We have determined the static and dynamical properties of the Ginzburg - Landau model, with global coupling of the spherical type, on some non-translationally invariant lattices. Our solutions show that, in agreement with general theorems, fractal lattices with finite ramification do not display a finite temperature phase transition for any embedding dimension, d. On the other hand, the dynamical behaviour associated with the phase ordering dynamics of a non-conserved order parameter is non-trivial. Our analysis reveals that the domain size R grows in time as and relates this exponent to the three exponents which characterize the static and dynamical properties of fractal structures, namely the fractal dimension of the lattice , the random walk dimension and the spectral dimension . We also present a brief renormalization group treatment of the model. Finally, we have considered lattices with infinite ramification numbers which have spectral dimensions larger that 2 and show a finite temperature phase transition.

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10.1088/0305-4470/30/4/010