Reference : Cohomologies and derived brackets of Leibniz algebras |

Dissertations and theses : Doctoral thesis | |||

Physical, chemical, mathematical & earth Sciences : Mathematics | |||

http://hdl.handle.net/10993/29353 | |||

Cohomologies and derived brackets of Leibniz algebras | |

English | |

Cai, Xiongwei [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > > ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Mathematics Research Unit] | |

13-Dec-2016 | |

University of Luxembourg, Luxembourg | |

Docteur en Mathématiques | |

Schlichenmaier, Martin | |

Thalmaier, Anton | |

Liu, Zhangju | |

Xu, Ping | |

Laurent-Gengoux, Camille | |

[en] Leibniz algebra ; Courant-Dorfman algebra ; standard cohomology ; naive cohomology ; crossed product ; derived bracket ; equivariant cohomology ; generalized action | |

[en] In this thesis, we work on the structure of Leibniz algebras and develop cohomology theories for them. The motivation comes from:
• Roytenberg, Stienon-Xu and Ginot-Grutzmann's work on standard and naive cohomology of Courant algebroids (Courant-Dorfman algebras). • Kosmann-Schwarzbach, Roytenberg and Alekseev-Xu's constructions of derived brackets for Courant algebroids. • The classical equivariant cohomology theory and the generalized geometry theory. This thesis consists of three parts: 1. We introduce standard cohomology and naive cohomology for a Leibniz algebra. We discuss their properties and show that they are isomorphic. By similar methods, we prove a generalization of Ginot-Grutzmann's theorem on transitive Courant algebroids, which was conjectured by Stienon-Xu. The relation between standard complexes of a Leibniz algebra and its corresponding crossed product is also discussed. 2. We observe a canonical 3-cochain in the standard complex of a Leibniz algebra. We construct a bracket on the subspace consisting of so-called representable cochains, and prove that the subspace becomes a graded Poisson algebra. Finally we show that for a fat Leibniz algebra, the Leibniz bracket can be represented as a derived bracket. 3. In spired by the notion of a Lie algebra action and the idea of generalized geometry, we introduce the notion of a generalized action of a Lie algebra g on a smooth manifold M, to be a homomorphism of Leibniz algebras from g to the generalized tangent bundle TM+T*M. We define the interior product and Lie derivative so that the standard complex of TM+T*M becomes a g differential algebra, then we discuss its equivariant cohomology. We also study the equivariant cohomology for a subcomplex of a Leibniz complex. | |

http://hdl.handle.net/10993/29353 |

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