Fei Qi

activity

20232026

collaborators

4 papers

math.QA2026

Deformation rigidity of some simple affine VOAs

Andrew R. Linshaw, Fei Qi

In this paper, we prove that simple affine vertex operator algebras with positive integral levels admit only trivial first-order deformations. Therefore, the deformation rigidity c…

math.QA2024

First-order deformations of freely generated vertex algebras

Vladimir Kovalchuk, Fei Qi

We solve the problem of how to classify the first-order vertex-algebraic deformations for any grading-restricted vertex algebra $V$ that is freely generated by homogeneous elements…

math.QA2023

Fermionic construction of the $\frac{Z}{2}$ -graded meromorphic open-string vertex algebra and its $Z_{2}$ -twisted module, II

Fei Qi

This paper continues with Part I. We define the module for a $\frac{Z}{2}$ -graded meromorphic open-string vertex algebra that is twisted by an involution and show that the…

math.QA2023

Fermionic construction of the $\frac{Z}{2}$ -graded meromorphic open-string vertex algebra and its $Z_{2}$ -twisted module, I

Francesco Fiordalisi, Fei Qi

We define the $\frac{Z}{2}$ -graded meromorphic open-string vertex algebra that is an appropriate noncommutative generalization of the vertex operator superalgebra. We also…

Deformation rigidity of some simple affine VOAs

First-order deformations of freely generated vertex algebras

Fermionic construction of the 2Z​-graded meromorphic open-string vertex algebra and its Z2​-twisted module, II

Fermionic construction of the 2Z​-graded meromorphic open-string vertex algebra and its Z2​-twisted module, I

Fermionic construction of the $\frac{Z}{2}$ -graded meromorphic open-string vertex algebra and its $Z_{2}$ -twisted module, II

Fermionic construction of the $\frac{Z}{2}$ -graded meromorphic open-string vertex algebra and its $Z_{2}$ -twisted module, I