*Forma,* Vol. 23 (No. 1), pp. 1-8, 2008

*Original Paper*

## Equilibria for Anisotropic Surface Energies and the Gielis Formula

Miyuki Koiso^{1} and Bennett Palmer^{2}

^{1}Department of Mathematics, Nara Women's University, Nara 630-8506, Japan

^{2}Department of Mathematics, Idaho State University, Pocatello, ID 83209, U.S.A.

*E-mail address: koiso@cc.nara-wu.ac.jp

(Received June 26, 2007; Accepted April 28, 2008)

**Keywords: **
Anisotropic Mean Curvature, Gielis Formula, Wulff Shape, Delaunay Surface

**Abstract. **
Anisotropic surface energies are used to model surface energies which depend on the direction of the surface normal. Equilibria of such energies are characterized as surfaces with *constant anisotropic mean curvature*. The surface of a crystal and certain interfaces of liquid crystals with an isotropic substrate give physical examples
of such equilibria. We produce examples of surfaces having constant anisotropic mean curvature for anisotropic energy functionals having a Wulff shape based on the Gielis formula.

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