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arXiv · 2012.14797

Symplectically convex and symplectically star-shaped curves -- a variational problem

Peter Albers·Serge Tabachnikov
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Abstract

In this article we propose a generalization of the 2-dimensional notions of convexity resp. being star-shaped to symplectic vector spaces. We call such curves symplectically convex resp. symplectically star-shaped. After presenting some basic results we study a family of variational problems for symplectically convex and symplectically star-shaped curves which is motivated by the affine isoperimetric inequality. These variational problems can be reduced back to two dimensions. For a range of the family parameter extremal points of the variational problem are rigid: they are multiply traversed conics. For all family parameters we determine when non-trivial first and second order deformations of conics exist. In the last section we present some conjectures and questions and two galleries created with the help of a Mathematica applet by Gil Bor.

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Peter Albers, Serge Tabachnikov. 2020-12-29. Symplectically convex and symplectically star-shaped curves -- a variational problem. https://doi.org/10.1007/s11784-022-00931-2

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