Geometry and Topology Seminar —— Euclidean Volume of a Cone Manifold over any Hyperbolic Knot is an Algebraic Number
报告人：Nikolay Abrosimov （Sobolev Institute of Mathematics, Novosibirsk）
时间：2025-04-16 15:10-17:00
地点：智华楼四元厅
【摘要】
The talk is based on our joint work with Alexander Kolpakov (Université de Neuchâtel, Switzerland) and Alexander Mednykh (Sobolev Institute of Mathematics, Novosibirsk).
A hyperbolic structure on a three-dimensional cone manifold with a knot as a singular set can usually be deformed into a limit Euclidean structure. In our paper we show that the corresponding normalized Euclidean volume of the manifold is always an algebraic number, i.e., a root of some polynomial with integer coefficients. This result is a generalization (for cone manifolds) of the well-known Sabitov theorem on the volumes of Euclidean polyhedra, which gave an answer to the bellows problem. The fact we established stands out against the background of hyperbolic volumes, the number-theoretic nature of which is usually quite complex. In addition to this theorem, we propose an algorithm that allows one to explicitly calculate the minimal polynomial for a normalized Euclidean volume.
