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- Yuly Billig
- Quantum Information Processing
- 2013

An explicit vertex operator algebra construction is given of a class of irreducible modules for toroidal Lie algebras.

- Yuly Billig
- 2008

In this paper, we generalize a result by Berman and Billig on weight modules over Lie algebras with polynomial multiplication. More precisely, we show that a highest weight module with an exp-polynomial " highest weight " has finite dimensional weight spaces. We also get a class of irreducible weight modules with finite dimensional weight spaces over… (More)

- Yuly Billig
- 2008

Vertex operators discovered by physicists in string theory have turned out to be important objects in mathematics. One can use vertex operators to construct various realizations of the irreducible highest weight representations for affine Kac-Moody algebras. Two of these, the principal and homogeneous realizations, are of particular interest. The principal… (More)

- Yuly Billig
- 2002

Representations of the twisted Heisenberg-Virasoro algebra at level zero. Abstract. We describe the structure of the irreducible highest weight modules for the twisted Heisenberg-Virasoro Lie algebra at level zero. We prove that such a module is either isomorphic to a Verma module or to a quotient of two Verma modules.

- Robert Moody, Yuly Billig, V Tor = V ˙ G ⊗ V + Hyp ⊗ V Sl N, V Hvir
- 2002

Energy-momentum tensor for the toroidal Lie algebras. Abstract. We construct vertex operator representations for the full (N + 1)-toroidal Lie algebra g. We associate with g a toroidal vertex operator algebra, which is a tensor product of an affine VOA, a sub-VOA of a hyperbolic lattice VOA, affine sl N VOA and a twisted Heisenberg-Virasoro VOA. The modules… (More)

- Yuly Billig
- 2008

Magnetic hydrodynamics with asymmetric stress tensor. In this paper we study equations of magnetic hydrodynamics with a stress tensor. We interpret this system as the generalized Euler equation associated with an abelian extension of the Lie algebra of vector fields with a non-trivial 2-cocycle. We use the Lie algebra approach to prove the energy… (More)

- Yuly Billig
- 2009

Toroidal Lie algebras are very natural multi-variable generalizations of affine Kac-Moody algebras. The theory of affine Lie algebras is rich and beautiful, having connections with diverse areas of mathematics and physics. Toroidal Lie algebras are also proving themselves to be useful for the applications. Frenkel, Jing and Wang [FJW] used representations… (More)

- Yuly Billig
- 2008

In this article we show how to construct hierarchies of partial differential equations from the vertex operator representations of toroidal Lie algebras. In the smallest example-rank 2 toroidal cover of sl 2-we obtain an extension of the KdV hierarchy. We use the action of the corresponding infinite-dimensional group to construct solutions for these… (More)

- Yuly Billig, Karl-Hermann Neeb
- 2007

In the present paper we determine for each parallelizable smooth compact manifold M the cohomology spaces H