The PBW filtration

Details The PBW filtration The PBW filtration

2007-02-26

arxiv.org/abs/math/0702797v1

Mathematics

Quantum Algebra

18 pages

Scientific paper

In this paper we study the PBW filtration on irreducible integrable highest weight representations of affine Kac-Moody algebra $\gh$. The $n$-th space of this filtration is spanned with the vectors $x_1... x_s v$, where $x_i\in\gh$, $s\le n$ and $v$ is a highest weight vector. For the vacuum module we give a conjectural description of the corresponding adjoint graded space in terms of generators and relations. For $\g$ of the type $A_1$ we prove our conjecture and derive the fermionic formula for the graded character.

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