English

Irreducible Jet modules for the vector field Lie algebra on $\mathbb{S}^1\times \mathbb{C}$

Representation Theory 2022-05-12 v2 Rings and Algebras

Abstract

For a commutative algebra AA over C\mathbb{C},denote g=Der(A)\mathfrak{g}=\text{Der}(A). A module over the smash product A#U(g)A\# U(\mathfrak{g}) is called a jet g\mathfrak{g}-module, where U(g)U(\mathfrak{g}) is the universal enveloping algebra of g\mathfrak{g}.In the present paper, we study jet modules in the case of A=C[t1±1,t2]A=\mathbb{C}[t_1^{\pm 1},t_2].We show that A#U(g)DU(L)A\#U(\mathfrak{g})\cong\mathcal{D}\otimes U(L), where D\mathcal{D} is the Weyl algebra C[t1±1,t2,t1,t2]\mathbb{C}[t_1^{\pm 1},t_2, \frac{\partial}{\partial t_1},\frac{\partial}{\partial t_2}], and LL is a Lie subalgebra of A#U(g)A\# U(\mathfrak{g}) called the jet Lie algebra corresponding to g\mathfrak{g}.Using a Lie algebra isomorphism θ:Lm1,0Δ\theta:L \rightarrow \mathfrak{m}_{1,0}\Delta, where m1,0Δ\mathfrak{m}_{1,0}\Delta is the subalgebra of vector fields vanishing at the point (1,0)(1,0), we show that any irreducible finite dimensional LL-module is isomorphic to an irreducible gl2\mathfrak{gl}_2-module. As an application, we give tensor product realizations of irreducible jet modules over g\mathfrak{g} with uniformly bounded weight spaces.

Keywords

Cite

@article{arxiv.2007.02260,
  title  = {Irreducible Jet modules for the vector field Lie algebra on $\mathbb{S}^1\times \mathbb{C}$},
  author = {Mengnan Niu and Genqiang Liu},
  journal= {arXiv preprint arXiv:2007.02260},
  year   = {2022}
}