Is there a true Model-D critical dynamics?

Details Is there a true Model-D critical dynamics? Is there a true Model-D critical dynamics?

2002-02-15

arxiv.org/abs/cond-mat/0202255v1

Physics

Condensed Matter

Statistical Mechanics

4 pages revtex4; to appear in Journal of Physics A Letters

Scientific paper

We show that non-locality in the conservation of both the order parameter and a noncritical density (model D dynamics) leads to new fixed points for critical dynamics. Depending upon the parameters characterizing the non-locality in the two fields, we find four regions: (i) model-A like where both the conservations are irrelevant (ii) model B-like with the conservation in the order parameter field relevant and the conservation in the coupling field irrelevant (iii) model C like where the conservation in the order parameter field is irrelevant but the conservation in the coupling field is relevant, and (iv) model D-like where both the conservations are relevant. While the first three behaviours are already known in dynamical critical phenomena, the last one is a novel phenomena due entirely to the non-locality in the two fields.

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