A generating function of the number of homomorphisms from a surface group into a finite group

陈述 ${\rm SL}_n$-绞股模的弗罗贝尼乌斯同态

Frobenius homomorphisms for stated ${\rm SL}_n$-skein modules

本文证明陈述 SL_n-绞股模上的弗罗贝尼乌斯同态将带框纽结映射为约化幂初等多项式的穿线，从而推广 n=2 情形并证实相关猜想。

Affine cubic surfaces and character varieties of knots

It is known that the fundamental group homomorphism $π_1(T^2) \to π_1(S^3\setminus K)$ induced by the inclusion of the boundary torus into the complement of a knot $K$ in $S^3$ is a complete knot invariant. Many classical invariants of knots arise from the natural (restriction) map induced by the above homomorphism on the $\mathrm{SL}_2$-character varieties of the corresponding fundamental groups. In our earlier work [BS16], we proposed a conjecture that the classical restriction map admits a canonical 2-parameter deformation into a smooth cubic surface. In this paper, we show that (modulo som…

Kauffman括号 skein代数与 Roger-Yang skein代数之间的一些小曲面的关系

A relationship between the Kauffman bracket skein algebras and Roger-Yang skein algebras of some small surfaces

本文研究了环面的Roger-Yang skein代数与Kauffman括号 skein代数之间的关系，通过同态映射刻画了代数的不可约有限维表示，并计算了结构常数以支持正性猜想。

The Roger-Yang skein algebra and the decorated Teichmuller space

Based on hyperbolic geometric considerations, Roger and Yang introduced an extension of the Kauffman bracket skein algebra that includes arcs. In particular, their skein algebra is a deformation quantization of a certain commutative curve algebra, and there is a Poisson algebra homomorphism between the curve algebra and the algebra of smooth functions on decorated Teichmuller space. In this paper, we consider surfaces with punctures which is not the 3-holed sphere and which have an ideal triangulation without self-folded edges or triangles. For those surfaces, we prove that Roger and Yang's Po…

Quantum torus methods for Kauffman bracket skein modules

We investigate aspects of Kauffman bracket skein algebras of surfaces and modules of 3-manifolds using quantum torus methods. These methods come in two flavors: embedding the skein algebra into a quantum torus related to quantum Teichmuller space, or filtering the algebra and obtaining an associated graded algebra that is a monomial subalgebra of a quantum torus. We utilize the former method to generalize the Chebyshev homomorphism of Bonahon and Wong between skein algebras of surfaces to a Chebyshev-Frobenius homomorphism between skein modules of marked 3-manifolds, in the course of which we …

Representations of the quantum Teichmuller space, and invariants of surface diffeomorphisms

We investigate the representation theory of the polynomial core of the quantum Teichmuller space of a punctured surface S. This is a purely algebraic object, closely related to the combinatorics of the simplicial complex of ideal cell decompositions of S. Our main result is that irreducible finite-dimensional representations of this polynomial core are classified, up to finitely many choices, by group homomorphisms from the fundamental group of the surface to the isometry group of the hyperbolic 3--space. We exploit this connection between algebra and hyperbolic geometry to exhibit new invaria…

Quantum traces for representations of surface groups in SL_2

We consider two different quantizations of the character variety consisting of all representations of surface groups in SL_2. One is the skein algebra considered by Przytycki-Sikora and Turaev. The other is the quantum Teichmuller space introduced by Chekhov-Fock and Kashaev. We construct a homomorphism from the skein algebra to the quantum Teichmuller space which, when restricted the classical case, corresponds to the equivalence between these two algebras through trace functions.