Characterizing slopes for torus knots, II
Geometric Topology
2021-06-08 v1
Abstract
A slope is called a characterizing slope for a given knot if whenever the --surgery on a knot is homeomorphic to the --surgery on via an orientation preserving homeomorphism, then . In a previous paper, we showed that, outside a certain finite set of slopes, only the negative integers could possibly be non-characterizing slopes for the torus knot . Applying recent work of Baldwin--Hu--Sivek, we improve our result by showing that a nontrivial slope is a characterizing slope for if and . In particular, every nontrivial L-space slope of is characterizing for . As a consequence, if a nontrivial -surgery on a non-torus knot in yields a manifold of finite fundamental group, then .
Cite
@article{arxiv.2106.02806,
title = {Characterizing slopes for torus knots, II},
author = {Yi Ni and Xingru Zhang},
journal= {arXiv preprint arXiv:2106.02806},
year = {2021}
}
Comments
7 pages, 2 figures