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48 results for surgery formulae

Study cosmetic surgeries on knots in homology spheres using Casson-Walker invariant.

problem Cosmetic surgeries on knots in homology spheres and their constraints.
method Rational surgery formula of the Casson-Walker invariant for 2-component links.
result Constraints on knots and surgery slopes for cosmetic surgeries.

We prove a monotonicity formula for mean curvature flow with surgery. This formula differs from Huisken's monotonicity formula by an extra term involving the mean curvature. As a consequence, we show that a surgically modified flow which is sufficiently close to a smooth flow in the sense of geometric measure theory is…

2013-12-01abs ↗pdf ↗

New formulas for knot invariants under specific surgeries.

problem Defining and proving splitting formulas for knot invariants.
method Defined a functorial extension of the Kricker invariant and proved splitting formulas for null Lagrangian-preserving surgery.
result Splitting formulas for the Kricker invariant under null Lagrangian-preserving surgery.

It is known that every oriented integral homology 3-sphere can be obtained from S^3 by a finite sequence of Borromean surgeries. We give an explicit formula for the variation of the Casson invariant under such a surgery move. The formula involves simple classical invariants, namely the framing, linking number and Milno…

2005-09-15abs ↗pdf ↗

Formula for knot concordance invariant derived from surgery on knots.

problem Defining knot concordance invariant via surgery on knots.
method Computation of knot Floer filtration induced by cable of meridian, formula in terms of original knot Floer complex.
result Knot concordance invariant defined equivalently via filtered maps on Heegaard Floer homology.

The study confirms that most positive 2-bridge knots up to 31 crossings do not have chirally cosmetic surgeries.

problem Determining which positive 2-bridge knots up to 31 crossings have chirally cosmetic surgeries.
method Using the obstruction formula from arXiv:2112.03144 and a Python program to compute classical knot invariants.
result Positive 2-bridge knots up to 31 crossings, except (2,2n+1)(2, 2n+1) torus knots, do not admit chirally cosmetic surgeries.

We give an explicit formula to compute the rotation number of a nullhomologous Legendrian knot in contact (1/n)-surgery diagrams along Legendrian links and obtain a corresponding result for the self-linking number of transverse knots. Moreover, we extend the formula by Ding-Geiges-Stipsicz for computing the d3-invarian…

2016-05-03abs ↗pdf ↗

The paper develops a bordered HF\mathit{HF}^- theory using link surgery formula.

problem Computing Heegaard Floer homology of 3-manifolds with torus boundaries.
method Introducing an associative algebra K\mathcal{K} and interpreting link surgery complexes as type-DD modules over K\mathcal{K}.
result Proves a connected sum formula and computes Heegaard Floer homology of various 3-manifolds.

The article calculates asymptotic expansions for quantum invariants from surgeries on Whitehead link components.

problem Calculating quantum invariants for 3-manifolds resulting from surgeries on Whitehead link components.
method Asymptotic expansion of relative Reshetikhin-Turaev and Turaev-Viro invariants.
result Asymptotic formulas for both invariants are derived.

We first present three graphic surgery formulae for the degree nn part ZnZ_n of the Kontsevich-Kuperberg-Thurston universal finite type invariant of rational homology spheres. Each of these three formulae determines an alternate sum of the form IN(1)IZn(MI)\sum_{I \subset N} (-1)^{\sharp I}Z_n(M_I) where NN is the set of com…

2007-03-12abs ↗pdf ↗

Two Dehn surgeries on a knot are called {\it purely cosmetic}, if they yield manifolds that are homeomorphic as oriented manifolds. Suppose there exist purely cosmetic surgeries on a knot in S3S^3, we show that the two surgery slopes must be the opposite of each other. One ingredient of our proof is a Dehn surgery form…

2010-09-23abs ↗pdf ↗

Let Θ(M,K) denote the 2-loop piece of (the logarithm of) the LMO invariant of a knot K in M, a ZHS^3. Forgetting the knot (by which we mean setting diagrams with legs to zero) specialises Θ(M,K) to λ(M), Casson's invariant. This note describes an extension of Casson's surgery formula for his invariant to Θ(M,K). To be …

2002-11-04abs ↗pdf ↗

Study shows how concordance surgery impacts a 4D knot invariant.

problem Understanding how concordance surgery affects a specific 4D knot invariant.
method Used sutured Floer TQFT and a perturbed version of sutured Floer homology.
result Formula involving the graded Lefschetz number of the concordance map on knot Floer homology.

In this note we specialize and illustrate the ideas developed in the paper math.DG/0201112 of the first author ("Index theory, eta forms, and Deligne cohomology ") in the case of the determinant line bundle. We discuss the surgery formula in the adiabatic limit using the adiabatic decomposition formula of the zeta regu…

2003-01-09abs ↗pdf ↗