Axially symmetric membranes with polar tethers

Details Axially symmetric membranes with polar tethers Axially symmetric membranes with polar tethers

2006-08-09

arxiv.org/abs/cond-mat/0608230v2

Physics

Condensed Matter

Soft Condensed Matter

13 pages, extended and revised version of Non-local sine-Gordon equation for the shape of axi-symmetric membranes

Scientific paper

10.1088/1751-8113/40/16/002

Axially symmetric equilibrium configurations of the conformally invariant Willmore energy are shown to satisfy an equation that is two orders lower in derivatives of the embedding functions than the equilibrium shape equation, not one as would be expected on the basis of axial symmetry. Modulo a translation along the axis, this equation involves a single free parameter c.If c\ne 0, a geometry with spherical topology will possess curvature singularities at its poles. The physical origin of the singularity is identified by examining the Noether charge associated with the translational invariance of the energy; it is consistent with an external axial force acting at the poles. A one-parameter family of exact solutions displaying a discocyte to stomatocyte transition is described.

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