### Abstract

Deformations of topological open string theories are described, with an emphasis on their algebraic structure. They are encoded in the mixed bulk-boundary correlators. They constitute the Hochschild complex of the open string algebra the complex of multilinear maps on the boundary Hubert space. This complex is known to have the structure of a Gerstenhaber algebra (Deligne theorem), which is also found in closed string theory. Generalising the case of function algebras with a B-field, we identify the algebraic operations of the bulk sector, in terms of the mixed correlators. This gives a physical realisation of the Deligne theorem. We translate to the language of certain operads (spaces of d-discs with gluing) and d-algebras, and comment on generalisations, notably to the AdS/CFT correspondence. The formalism is applied to the topological A- and B-models on the disc.

Original language | English (US) |
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Pages (from-to) | XXXXV-28 |

Journal | Journal of High Energy Physics |

Volume | 5 |

Issue number | 1 |

State | Published - Dec 1 2001 |

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### Keywords

- Chern-Simons Theories
- Conformal Field Models in String Theory
- Topological Field Theories

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Journal of High Energy Physics*,

*5*(1), XXXXV-28.