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arxiv: hep-th/9909023 · v1 · submitted 1999-09-04 · ✦ hep-th · cond-mat

3D van der Waals sigma-model and topological excitations with logarithmic energy

classification ✦ hep-th cond-mat
keywords excitationstopologicalenergylogarithmicsigma-modelwaalsconfigurationsconformal
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The 3D vector van der Waals (or conformal) nonlinear sigma-model is proposed. It is shown that it has the "hedgehog"-like topological excitations with logarithmic energy. Their "neutral" configurations have nontrivial topological structures described by Hopf invariant. A possible influence of these excitations on the properties of the model are discussed.

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