A Hopfion is a type of topological soliton, which is a stable, localized solution to certain nonlinear field equations that exhibit a nontrivial topology. Specifically, Hopfions are associated with the Hopf fibration in topology, which relates spheres of different dimensions in a specific way. In the context of field theories, Hopfions can be thought of as higher-dimensional generalizations of other topological solitons, like skyrmions.
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