Abstract
Lagrangian curves in \(\mathbb {R}^{4}\) entertain intriguing relationships with second order deformation of plane curves under the special affine group and null curves in a 3-dimensional Lorentzian space form. We provide a natural affine symplectic frame for Lagrangian curves. It allows us to classify Lagrangian curves with constant symplectic curvatures, to construct a class of Lagrangian tori in \(\mathbb {R}^{4}\) and determine Lagrangian geodesics.
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Notes
An exterior differential form is semi-basic if it annihilates the vertical vectors of the fibration.
A smooth immersed curve \(\delta:I \to\varLambda_{+}^{2}\) is null if its tangent vectors are isotropic (null) with respect to the conformal structure of \(\varLambda_{+}^{2}\).
Contrary to the moving frame construction, the invariantization does not restrict to locally free actions. See [19].
We first write R above in terms of the Λ(X (i),X (j)) so has to visualize the Gram-Schmidt process. The expression of R −1 in terms of the symplectic curvatures κ i is given afterwards.
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This research is partially supproted by MIUR (Italy) under the PRIN project Varieta’ reali e complesse: geometria, topologia e analisi armonica. E. Musso partially supported by GNSAGA of INDAM.
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Musso, E., Hubert, E. Lagrangian Curves in a 4-Dimensional Affine Symplectic Space. Acta Appl Math 134, 133–160 (2014). https://doi.org/10.1007/s10440-014-9874-3
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DOI: https://doi.org/10.1007/s10440-014-9874-3