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28 March 2024
 
  » arxiv » math.QA/0103090

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Regular representations and Huang-Lepowsky's tensor functors for vertex operator algebras
Haisheng Li ;
Date 14 Mar 2001
Subject Quantum Algebra | math.QA hep-th
AbstractThis is the second paper in a series to study regular representations for vertex operator algebras. In this paper, given a module $W$ for a vertex operator algebra $V$, we construct, out of the dual space $W^{*}$, a family of canonical (weak) $Votimes V$-modules called ${cal{D}}_{Q(z)}(W)$ parametrized by a nonzero complex number $z$. We prove that for $V$-modules $W,W_{1}$ and $W_{2}$, a $Q(z)$-intertwining map of type ${W’choose W_{1}W_{2}}$ in the sense of Huang and Lepowsky exactly amounts to a $Votimes V$-homomorphism from $W_{1}otimes W_{2}$ to ${cal{D}}_{Q(z)}(W)$ and that a $Q(z)$-tensor product of $V$-modules $W_{1}$ and $W_{2}$ in the sense of Huang and Lepowsky amounts to a universal from $W_{1}otimes W_{2}$ to the functor ${cal{F}}_{Q(z)}$, where ${cal{F}}_{Q(z)}$ is a functor from the category of $V$-modules to the category of weak $Votimes V$-modules defined by ${cal{F}}_{Q(z)}(W)={cal{D}}_{Q(z)}(W’)$ for a $V$-module $W$. Furthermore, Huang-Lepowsky’s $P(z)$ and $Q(z)$-tensor functors for the category of $V$-modules are extended to functors $T_{P(z)}$ and $T_{Q(z)}$ from the category of $Votimes V$-modules to the category of $V$-modules. It is proved that functors ${cal{F}}_{P(z)}$ and ${cal{F}}_{Q(z)}$ are right adjoints of $T_{P(z)}$ and $T_{Q(z)}$, respectively.
Source arXiv, math.QA/0103090
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