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0111 · Jun 201819922001200920172026
9 results for slice-torus

New invariant defined for unoriented knots, proving no factorization through topological concordance.

problem Defining and proving properties of unoriented slice-torus invariants.
method Introducing and proving properties of unoriented slice-torus invariants.
result Unoriented slice-torus invariants do not factor through the topological concordance group.

In the present paper we extend the definition of slice-torus invariant to links. We prove a few properties of the newly-defined slice-torus link invariants: the behaviour under crossing change, a slice genus bound, an obstruction to strong sliceness, and a combinatorial bound. Furthermore, we provide an application to …

2018-06-27abs ↗pdf ↗

Abstract invariant cannot be expressed using various slice-torus invariants.

problem Cannot express Iida-Taniguchi's slice-torus invariant using other known invariants.
method Analysis of various known invariants and their properties.
result Iida-Taniguchi's slice-torus invariant cannot be realized as a linear combination of other invariants.

Lower bounds for a knot invariant are derived using computations and cobordism inequality.

problem Calculating the concordance invariant s#s^{\#} for knots.
method Computation for torus knots, cobordism inequality of s#s^{\#}, and arguments for slice-torus invariants.
result Lower bounds for s#s^{\#} are derived for knots.

Study transverse knots and symplectic surfaces using Seiberg-Witten monopole equations.

problem Investigate transverse knots and symplectic surfaces via Seiberg-Witten monopole equations.
method Equivariant Seiberg-Witten theory on branched covers, introducing a novel slice-torus invariant.
result Determine the value of slice-torus invariant for certain Montesinos knots within a deviation of 2.

The study establishes conditions for positive and quasi-positive links.

problem Characterizing and testing positive and quasi-positive links.
method Proves necessary conditions for link concordance and positivity.
result Characterizes positive links with unlinking number 1 and 2, and tests positive links as closures of positive braids.