English

On the Uniqueness of Certain Types of Circle Packings on Translation Surfaces

Differential Geometry 2025-01-23 v1

Abstract

Consider a collection of finitely many polygons in C\mathbb C, such that for each side of each polygon, there exists another side of some polygon in the collection (possibly the same) that is parallel and of equal length. A translation surface is the surface formed by identifying these opposite sides with one another. The H(1,1)H(1, 1) stratum consists of genus two translation surfaces with two singularities of order one. A circle packing corresponding to a graph GG is a configuration of disjoint disks such that each vertex of GG corresponds to a circle, two disks are externally tangent if and only if their vertices are connected by an edge in GG, and GG is a triangulation of the surface. It is proven that for certain circle packings on H(1,1)H(1, 1) translation surfaces, there are only a finite number of ways the packing can vary without changing the contacts graph, if two disks along the slit are fixed in place. These variations can be explicitly characterized using a new concept known as splitting bigons. Finally, the uniqueness theorem is generalized to a specific type of translation surfaces with arbitrary genus g2g \geq 2.

Keywords

Cite

@article{arxiv.2501.12552,
  title  = {On the Uniqueness of Certain Types of Circle Packings on Translation Surfaces},
  author = {Nilay Mishra},
  journal= {arXiv preprint arXiv:2501.12552},
  year   = {2025}
}