Abstract
With this chapter we begin our study of constructing normal Coulomb frames, here for surfaces immersed in Euclidean space \({\mathbb{R}}^{4}.\)Normal Coulomb frames are critical for a new functional of total torsion. We present the associated Euler–Lagrange equation and discuss its solution via a Neumann boundary value problem. A proof of the “minimal character” of normal Coulomb frames follows immediately.Using methods from potential theory and complex analysis we establish various analytical tools to control these special frames. For example, we present two different methods to bound their torsion (connection) coefficients. Methods from the theory of generalized analytic functions will play again an important role.We conclude the third chapter with a class of minimal graphs for which we can explicitly compute normal Coulomb frames.
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- 1.
In Sect. 2.1.2 we have already discussed surfaces with parallel mean curvature vector and a possible connection to the curvatures of their normal bundles.
- 2.
The constants c 1, c 2 and C 1, C 2 below depend also on the domain \(\overline{B}.\)
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Fröhlich, S. (2012). Normal Coulomb Frames in \({\mathbb{R}}^{4}\) . In: Coulomb Frames in the Normal Bundle of Surfaces in Euclidean Spaces. Lecture Notes in Mathematics, vol 2053. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29846-2_3
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