Abstract.
The Fréchet manifold \({\cal E}/_{\!\sim}\) of all embeddings (up to orientation preserving reparametrizations) of the circle in S 3 has a canonical weak Riemannian metric. We use the characterization obtained by H. Gluck and F. Warner of the oriented great circle fibrations of S 3 to prove that among all such fibrations π:S 3→B, the manifold B consisting of the oriented fibers is totally geodesic in \({\cal E}/_{\sim }\), or has minimum volume or diameter with the induced metric, exactly when π is a Hopf fibration.
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Partially supported by foncyt, Antorchas, ciem (conicet) and secyt (unc).
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Salvai, M. Some Geometric Characterizations of the Hopf Fibrations of the Three-Sphere. Mh Math 147, 173–177 (2006). https://doi.org/10.1007/s00605-005-0327-y
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DOI: https://doi.org/10.1007/s00605-005-0327-y