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48 results for $U_q \mathfrak{sl}(2)$

A new invariant for links generalizes Alexander polynomial for sl_3.

problem Defining a non-abelian generalization of the Alexander polynomial.
method Using quantum sl3\mathfrak{sl}_3 representations and Laurent polynomials.
result Established a direct relation between Δsl3Δ_{\mathfrak{sl}_3} and the Alexander polynomial.

Study unbounded sl3\mathfrak{sl}_3-laminations around punctures.

problem Classify and understand structures of sl3\mathfrak{sl}_3-laminations at punctures.
method Relate to root data, classify signed webs, describe tropicalization, clarify relationships with other approaches.
result Clarify the relationship between sl3\mathfrak{sl}_3-laminations and other approaches.

The paper calculates colored Jones polynomials for specific link configurations.

problem Computing colored Jones polynomials in general is difficult, but the paper provides explicit formulas.
method Uses Kuperberg's A2A_2 skein relation and one-row Young diagrams.
result Derives the sl3\mathfrak{sl}_3 tail of (2,2m)(2,2m)-torus links and false theta series.

Researchers calculate colored Jones polynomials for pretzel links using Kuperberg's theory.

problem Calculating colored Jones polynomials for general oriented links is difficult.
method Using Kuperberg's linear skein theory, they focus on one-row polynomials for pretzel links.
result Existence of tails for specific pretzel knots' Jones polynomials is shown.

Quantum cluster algebra constructed from web skein relations on surfaces.

problem Quantization of cluster structures on moduli spaces of SL3 local systems.
method Constructing a quantum cluster algebra inside the skew-field of a skein algebra of unpunctured surfaces.
result Laurent expressions of webs in clusters have positive coefficients.

Study on quantum sl3\mathfrak{sl}_3 invariant for positive links.

problem Characterizing and understanding the quantum sl3\mathfrak{sl}_3 invariant of positive links.
method Skein theory of sl3\mathfrak{sl}_3-webs, explicit formulae, diagrammatic quantities, obstructions.
result Positive links are fibered if and only if the second coefficient of the polynomial is 1.

Defines and parametrizes sl(2)\mathfrak{sl}(2)-type singular fibres in symplectic and odd orthogonal Hitchin systems.

problem Characterizing and understanding singular fibres in Hitchin systems.
method Stratification by semi-abelian spectral data, study of irreducible components, global description of degenerations.
result Extension of Langlands duality to sl(2)\mathfrak{sl}(2)-type Hitchin fibres.

The paper extends Khovanov homology results to sl(n)\mathfrak{sl}(n) homologies and provides bounds on knot properties.

problem Extending Khovanov homology results to sl(n)\mathfrak{sl}(n) homologies and knot properties.
method Spectral sequence arguments and Levine-Zemke's ribbon concordance obstruction.
result Bounds on the alternation number and Turaev genus of knots.

We give a purely combinatorial formula for evaluating closed decorated foams. Our evaluation gives an integral polynomial and is directly connected to an integral equivariant version of the slN\mathfrak{sl}_N link homology categorifying the slN\mathfrak{sl}_N link polynomial. We also provide connections to the equivarian…

2017-02-14abs ↗pdf ↗

We find two different families of Sp(2,R)Sp(2,R) symmetric G2G_2 structures in seven dimensions. These are G2G_2 structures with G2G_2 being the split real form of the simple exceptional complex Lie group G2G_2. The first family has τ20τ_2\equiv 0, while the second family has τ1τ20τ_1\equivτ_2\equiv 0. The families are differen…

2019-08-13abs ↗pdf ↗

Extends Lawrence's representations to integral Uqsl(2)U_q \mathfrak{sl}(2) Verma-modules and braid groups.

problem Integrating Lawrence's representations into Uqsl(2)U_q \mathfrak{sl}(2) Verma-modules and braid groups.
method Defining homological operators and showing they provide a representation for Uqsl(2)U_q \mathfrak{sl}(2), establishing isomorphisms and preserving key properties.
result Recovering an integral version of Kohno's theorem for Verma-modules and braid group representations.

Lifts an sl2\mathfrak{sl}_2 action to annular Khovanov homology's stable refinement.

problem Stable refinement of annular Khovanov homology's sl2\mathfrak{sl}_2 action.
method Lifts actions of sl2\mathfrak{sl}_2 generators to maps of spectra, using cancellations in cube of resolutions.
result Commutativity of sl2\mathfrak{sl}_2 action with Steenrod algebra action.

In this paper we use Kuperberg's sl3\mathfrak{sl}_3-webs and Khovanov's sl3\mathfrak{sl}_3-foams to define a new algebra KSK^S, which we call the sl3\mathfrak{sl}_3-web algebra. It is the sl3\mathfrak{sl}_3 analogue of Khovanov's arc algebra. We prove that KSK^S is a graded symmetric Frobenius algebra. Furthermore, we cate…

2012-06-11abs ↗pdf ↗

The paper connects isomonodromic and isospectral deformations for sl2(C)\mathfrak{sl}_2(\mathbb{C}) connections.

problem Connecting isomonodromic and isospectral deformations for sl2(C)\mathfrak{sl}_2(\mathbb{C}) connections.
method Explicitly constructing Lax pairs and Darboux coordinates to bridge isomonodromic and isospectral deformations.
result Explicit change of Darboux coordinates to match spectral invariants, solving an open issue.

Quantum invariants from Uhsl(21)U_h\mathfrak{sl}(2|1) are q-holonomic.

problem Understanding quantum invariants from a specific quantum group.
method Demonstrated q-holonomic property through quantum group representations.
result Existence of an underlying field theory for these quantum invariants.

In this article we construct link invariants and 3-manifold invariants from the quantum group associated with Lie superalgebra sl(21)\mathfrak{sl}(2|1). This construction based on nilpotent irreducible finite dimensional representations of quantum group Uξsl(21)\mathcal{U}_ξ\mathfrak{sl}(2|1) where ξξ is a root of unity of odd …

2016-07-13abs ↗pdf ↗

Formula for sl2\mathfrak{sl}_2 weight system on complete bipartite graphs.

problem Computing values of sl2\mathfrak{sl}_2 weight system for chord diagrams.
method Chmutov-Varchenko recurrence relation, Hopf algebra projections.
result Computed values for chord diagrams with complete bipartite intersection graphs.

We define and study the category of symmetric sl2\mathfrak{sl}_2-webs. This category is a combinatorial description of the category of all finite dimensional quantum sl2\mathfrak{sl}_2-modules. Explicitly, we show that (the additive closure of) the symmetric sl2\mathfrak{sl}_2-spider is (braided monoidally) equivalent to …

2015-01-05abs ↗pdf ↗

The colored Jones polynomial is a qq-polynomial invariant of links colored by irreducible representations of a simple Lie algebra. A qq-series called a tail is obtained as the limit of the sl2\mathfrak{sl}_2 colored Jones polynomials {Jn(K;q)}n\{J_n(K;q)\}_n for some link KK, for example, an alternating link. For the $\mathf…

2016-12-07abs ↗pdf ↗

We suggest an index-free formalism allowing to simplify many computations in Riemann geometry. The main ingredients are forms with values in a Clifford algebra and an action of the group sl2×sl2\mathfrak{sl}_2\times \mathfrak{sl}_2 on such forms.

2018-09-29abs ↗pdf ↗

Study Poisson cohomology and linearize Lie algebra structures.

problem Linearize Poisson structures on sl2(C)\mathfrak{sl}_2(\mathbb{C}).
method Calculate Poisson cohomology, construct homotopy operators, develop Nash-Moser method.
result Show that Poisson structures linearizable at zero are flat.

Study shows link polynomial evaluations from Heegaard Floer theory.

problem Link polynomial evaluations from Heegaard Floer theory.
method Definition of Euler characteristic for fractionally-graded complexes based on roots of unity.
result Equality of Alexander polynomial evaluations and sl(n)\mathfrak{sl}(n) polynomial evaluations at certain roots of unity.

Quantum invariants derived from Uq(sl2)\mathcal{U}_q(\mathfrak{sl}_2) link holonomy.

problem Quantum invariants of links and their relations.
method Using quantum groups and Schur-Weyl duality, constructing quantum holonomy invariants.
result Quantum invariants of links can be derived from Uq(sl2)\mathcal{U}_q(\mathfrak{sl}_2) representations.

Frobenius homomorphisms for SL_n skein modules generalize knot theory results.

problem Quantum group representations and skein theory for SL_n character varieties.
method Representation theory of quantum groups and skein theory.
result Frobenius homomorphisms for stated SL_n skein modules are defined and their properties are explored.

We give a purely combinatorial construction of colored sln\mathfrak{sl}_n link homology. The invariant takes values in a 2-category where 2-morphisms are given by foams, singular cobordisms between sln\mathfrak{sl}_n webs; applying a (TQFT-like) representable functor recovers (colored) Khovanov-Rozansky homology. Novel f…

2014-05-22abs ↗pdf ↗

Cluster algebras match for specific Lie algebras and surfaces.

problem Matching cluster algebras with upper cluster algebras for certain Lie algebras and surfaces.
method Proof based on moduli space function ring and Wilson lines.
result Cluster algebras match upper cluster algebras for specified Lie algebras and surfaces.

Study cohomology spaces of sl(2) acting on n-ary differential operators.

problem Computing cohomology spaces for sl(2) action on n-ary differential operators.
method Analyzes polynomial μ-densities as sl(2) modules and computes cohomological spaces H^2.
result Computed cohomological spaces H^2 of sl(2) on n-ary differential operators.

Characters from logarithmic VOAs linked to torus link invariants.

problem Understanding characters of logarithmic vertex operator algebras.
method Relating characters to coloured Jones invariants of torus links.
result Characters of logarithmic VOAs are limits of coloured Jones invariants of torus links.