Open-string vertex algebras, tensor categories and operads

Yi Zhi Huang, Liang Kong

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


We introduce notions of open-string vertex algebra, conformal open-string vertex algebra and variants of these notions. These are "open-string- theoretic", "non-commutative" generalizations of the notions of vertex algebra and of conformal vertex algebra. Given an open-string vertex algebra, we show that there exists a vertex algebra, which we call the "meromorphic center," inside the original algebra such that the original algebra yields a module and also an intertwining operator for the meromorphic center. This result gives us a general method for constructing open-string vertex algebras. Besides obvious examples obtained from associative algebras and vertex (super)algebras, we give a nontrivial example constructed from the minimal model of central charge c = 1/2. We establish an equivalence between the associative algebras in the braided tensor category of modules for a suitable vertex operator algebra and the grading-restricted conformal open-string vertex algebras containing a vertex operator algebra isomorphic to the given vertex operator algebra. We also give a geometric and operadic formulation of the notion of grading-restricted conformal open-string vertex algebra, we prove two isomorphism theorems, and in particular, we show that such an algebra gives a projective algebra over what we call the "Swiss-cheese partial operad".

Original languageEnglish (US)
Pages (from-to)433-471
Number of pages39
JournalCommunications In Mathematical Physics
Issue number3
StatePublished - Oct 2004

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Mathematical Physics


Dive into the research topics of 'Open-string vertex algebras, tensor categories and operads'. Together they form a unique fingerprint.

Cite this