Variational geometry for surfaces in conformally flat space

Variational geometry for surfaces in conformally flat space

In this paper, it is shown that a closed surface in 3-dimensional harmonic conformally flat space is minimal if the sign of the mean curvature does not change. Also, it is determined that the critical point of mean curvature functional of the surface is homeomorphic to the sphere.

___

  • [1] Do Carmo M. Differential geometry of curves and surfaces. By prentice-Hall, Inc, 1976.
  • [2] Espinar J, G´alvez J, Rosenberg H. Complete surfaces with positive extrinsic curvature in product spaces. Mathematics. Commentarii Mathematici Helvetici 2007; 84 (2): 351-386.
  • [3] Lopez R. Constant mean curvature surfaces with boundry. Springer-Verlag Berlin Heidelberg, 2013.
  • [4] Montaldo S, Onnis I. Invariant surfaces of a three-dimensional manifold with constant Gauss curvature. Journal of Geometry and Physics 2005; 55 (4): 440-449.
  • [5] Nitsche J. Lectures on minimal surfaces. Cambridge University Press, 2011.
  • [6] Osserman R. A survey of minimal surfaces. Dover Publications, New York, 1986.
  • [7] Verpoort S. The geometry of the second fundamental form: Curvature Properties and Variational Aspects. Katholieke Universiteit Leuven, 2008.