A knot in the 3–sphere is called an L-space knot if it admits a nontrivial Dehn surgery yielding an L-space, ie a rational homology 3–sphere with the smallest possible Heegaard Floer homology. Given a knot K, take an unknotted circle c and twist K n times along c to obtain a twist family {Kn}. We give a sufficient condition for {Kn} to contain infinitely many L-space knots. As an application we show that for each torus knot and each hyperbolic Berge knot K, we can take c so that the twist family {Kn} contains infinitely many hyperbolic L-space knots. We also demonstrate that there is a twist family of hyperbolic L-space knots each member of which has tunnel number greater than one.
Keywords: L-space surgery, L-space knot, twisting, seiferter, tunnel number
Motegi, Kimihiko  1
@article{10_2140_agt_2016_16_1727,
author = {Motegi, Kimihiko},
title = {L-space surgery and twisting operation},
journal = {Algebraic and Geometric Topology},
pages = {1727--1772},
year = {2016},
volume = {16},
number = {3},
doi = {10.2140/agt.2016.16.1727},
url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2016.16.1727/}
}
Motegi, Kimihiko. L-space surgery and twisting operation. Algebraic and Geometric Topology, Tome 16 (2016) no. 3, pp. 1727-1772. doi: 10.2140/agt.2016.16.1727
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