scholarly journals Permutation orbifolds of š”°š”©2 vertex operator algebras

10.3336/gm.55.2.08 ā—½  
2020 ā—½  
Vol 55 (2) ā—½  
pp. 277-300
Author(s):  
Antun Milas ā—½  
ā—½  
Michael Penn ā—½  
Keyword(s):  
Vertex Operator ā—½  
Operator Algebra ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Vertex Operator Algebras ā—½  
Simple Quotient

We analyze two types of permutation orbifolds: (i) S2-orbifolds of the universal level k vertex operator algebra Vk(š”°š”©2) and of its simple quotient Lk(š”°š”©2), and (ii) the S3-orbifold of the level one simple vertex operator algebra L1(š”°š”©2). We determine their structures and discuss related W-algebras.

scholarly journals VIRASORO CORRELATION FUNCTIONS FOR VERTEX OPERATOR ALGEBRAS

2012 ā—½  
Vol 23 (10) ā—½  
pp. 1250106 ā—½  
Author(s):  
DONNY HURLEY ā—½  
MICHAEL P. TUITE
Keyword(s):  
Graph Theory ā—½  
Vertex Operator ā—½  
Generating Functions ā—½  
Operator Algebra ā—½  
Correlation Functions ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Vertex Operator Algebras ā—½  
Genus Zero ā—½  
Genus One

We consider all genus zero and genus one correlation functions for the Virasoro vacuum descendants of a vertex operator algebra. These are described in terms of explicit generating functions that can be combinatorially expressed in terms of graph theory related to derangements in the genus zero case and to partial permutations in the genus one case.

scholarly journals Principal subspaces of twisted modules for certain lattice vertex operator algebras

2019 ā—½  
Vol 30 (10) ā—½  
pp. 1950048 ā—½  
Author(s):  
Michael Penn ā—½  
Christopher Sadowski ā—½  
Gautam Webb
Keyword(s):  
Algebraic Structure ā—½  
Vertex Operator ā—½  
Operator Algebra ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Gram Matrix ā—½  
Vertex Operator Algebras ā—½  
Generators And Relations ā—½  
The Third ā—½  
Exact Sequences

This is the third in a series of papers studying the vertex-algebraic structure of principal subspaces of twisted modules for lattice vertex operator algebras. We focus primarily on lattices [Formula: see text] whose Gram matrix contains only non-negative entries. We develop further ideas originally presented by Calinescu, Lepowsky, and Milas to find presentations (generators and relations) of the principal subspace of a certain natural twisted module for the vertex operator algebra [Formula: see text]. We then use these presentations to construct exact sequences involving this principal subspace, which give a set of recursions satisfied by the multigraded dimension of the principal subspace and allow us to find the multigraded dimension of the principal subspace.

Classification of irreducible weak modules over Virasoro vertex operator algebras

2019 ā—½  
Vol 30 (11) ā—½  
pp. 1950054
Author(s):  
Guobo Chen ā—½  
Dejia Cheng ā—½  
Jianzhi Han ā—½  
Yucai Su
Keyword(s):  
Vertex Operator ā—½  
Operator Algebra ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Vertex Operator Algebras ā—½  
Positive Integers ā—½  
Coprime Positive Integers

The classification of irreducible weak modules over the Virasoro vertex operator algebra [Formula: see text] is obtained in this paper. As one of the main results, we also classify all irreducible weak modules over the simple Virasoro vertex operator algebras [Formula: see text] for [Formula: see text] [Formula: see text], where [Formula: see text] are coprime positive integers.

scholarly journals GENUS-ZERO MODULAR FUNCTORS AND INTERTWINING OPERATOR ALGEBRAS

1998 ā—½  
Vol 09 (07) ā—½  
pp. 845-863 ā—½  
Author(s):  
YI-ZHI HUANG
Keyword(s):  
Vertex Operator ā—½  
Operator Algebra ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Central Charge ā—½  
Vertex Operator Algebras ā—½  
Main Step ā—½  
Group Representations ā—½  
Genus Zero ā—½  
Intertwining Operator

In [7] and [9], the author introduced the notion of intertwining operator algebra, a nonmeromorphic generalization of the notion of vertex operator algebra involving monodromies. The problem of constructing intertwining operator algebras from representations of suitable vertex operator algebras was solved implicitly earlier in [5]. In the present paper, we generalize the geometric and operadic formulation of the notion of vertex operator algebra given in [3, 4, 11, 12, 8] to the notion of intertwining operator algebra. We show that the category of intertwining operator algebras of central charge [Formula: see text] is isomorphic to the category of algebras over rational genus-zero modular functors (certain analytic partial operads) of central charge c satisfying a certain generalized meromorphicity property. This result is one main step in the construction of genus-zero conformal field theories from representations of vertex operator algebras announced in [7]. One byproduct of the proof of the present isomorphism theorem is a geometric construction of (framed) braid group representations from intertwining operator algebras and, in particular, from representations of suitable vertex operator algebras.

scholarly journals TWISTED VERTEX OPERATORS AND BERNOULLI POLYNOMIALS

2006 ā—½  
Vol 08 (02) ā—½  
pp. 247-307 ā—½  
Author(s):  
B. DOYON ā—½  
J. LEPOWSKY ā—½  
A. MILAS
Keyword(s):  
Vertex Operator ā—½  
Operator Algebra ā—½  
Central Extension ā—½  
Vertex Operator Algebra ā—½  
Differential Operators ā—½  
Operator Algebras ā—½  
Bernoulli Polynomials ā—½  
Vertex Operator Algebras ā—½  
Vertex Operators ā—½  
Special Case

Using general principles in the theory of vertex operator algebras and their twisted modules, we obtain a bosonic, twisted construction of a certain central extension of a Lie algebra of differential operators on the circle, for an arbitrary twisting automorphism. The construction involves the Bernoulli polynomials in a fundamental way. We develop new identities and principles in the theory of vertex operator algebras and their twisted modules, and explain the construction by applying general results, including an identity that we call modified weak associativity, to the Heisenberg vertex operator algebra. This paper gives proofs and further explanations of results announced earlier. It is a generalization to twisted vertex operators of work announced by the second author some time ago, and includes as a special case the proof of the main results of that work.

A characterization of vertex operator algebras V+ā„¤Ī±: I

2015 ā—½  
Vol 2015 (709) ā—½  
Author(s):  
Chongying Dong ā—½  
Cuipo Jiang
Keyword(s):  
Vertex Operator ā—½  
Operator Algebra ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Vertex Operator Algebras

AbstractA characterization of vertex operator algebra

DECOMPOSITION OF THE VERTEX OPERATOR ALGEBRA $V_{\sqrt{2}D_l}$

2001 ā—½  
Vol 03 (01) ā—½  
pp. 137-151 ā—½  
Author(s):  
CHONGYING DONG ā—½  
CHING HUNG LAM ā—½  
HIROMICHI YAMADA
Keyword(s):  
Tensor Product ā—½  
Vertex Operator ā—½  
Operator Algebra ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Vertex Operator Algebras ā—½  
Root Lattice ā—½  
Type D

We determine the decomposition of [Formula: see text] into a sum of irreducible T-modules for general l where Dl is the root lattice of type Dl and T is the tensor product of l+1 Virasoro vertex operator algebras with central charges c1=1/2, c2=7/10, c3=4/5, and ci=1 for 4ā‰¤iā‰¤l+1.

scholarly journals SEMI-INFINITE FORMS AND TOPOLOGICAL VERTEX OPERATOR ALGEBRAS

2000 ā—½  
Vol 02 (02) ā—½  
pp. 191-241 ā—½  
Author(s):  
YI-ZHI HUANG ā—½  
WENHUA ZHAO
Keyword(s):  
Moduli Spaces ā—½  
Vertex Operator ā—½  
Operator Algebra ā—½  
Riemann Surfaces ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Vertex Algebra ā—½  
Vertex Operator Algebras ā—½  
Topological Vertex ā—½  
Type K

Semi-infinite forms on the moduli spaces of genus-zero Riemann surfaces with punctures and local coordinates are introduced. A partial operad of semi-infinite forms is constructed. Using semi-infinite forms and motivated by a partial suboperad of the partial operad of semi-infinite forms, topological vertex partial operads of type k<0 and strong topological vertex partial operads of type k<0 are constructed. It is proved that the category of (locally-)grading-restricted (strong) topological vertex operator algebras of type k<0 and the category of (weakly) meromorphic ā„¤Ć—ā„¤-graded algebras over the (strong) topological vertex partial operad of type k are isomorphic. As an application of this isomorphism theorem, the following conjecture of Lian-Zuckerman and Kimura-Voronov-Zuckerman is proved: A strong topological vertex operator algebra gives a (weak) homotopy Gerstenhaber algebra. These results hold in particular for the tensor product of the moonshine module vertex operator algebra, the vertex algebra constructed from a rank 2 Lorentz lattice and the ghost vertex operator algebra, studied in detail first by Lian and Zuckerman.

scholarly journals Foliation of a space associated to vertex operator algebra

2021 ā—½  
Author(s):  
A. Zuevsky
Keyword(s):  
Riemann Surface ā—½  
Vertex Operator ā—½  
Operator Algebra ā—½  
Correlation Functions ā—½  
Riemann Surfaces ā—½  
Vertex Operator Algebra ā—½  
Operator Algebras ā—½  
Vertex Operator Algebras

In this paper, we construct the foliation of a space associated to correlation functions of vertex operator algebras, considered on Riemann surfaces. We prove that the computation of general genus g correlation functions determines a foliation on the space associated to these correlation functions a sewn Riemann surface. Certain further applications of the definition are proposed.

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