On the Geometry of Multi-Dirac Structures and Gerstenhaber Algebras

Details On the Geometry of Multi-Dirac Structures and Gerstenhaber Algebras On the Geometry of Multi-Dirac Structures and Gerstenhaber Algebras

2011-02-14

arxiv.org/abs/1102.2835v2

J. Geom. Phys. 61 (2011), nr. 8, pp. 1415-1425

Mathematics

Differential Geometry

19 pages; v2: different convention for degree

Scientific paper

10.1016/j.geomphys.2011.03.005

In a companion paper, we introduced a notion of multi-Dirac structures, a graded version of Dirac structures, and we discussed their relevance for classical field theories. In the current paper we focus on the geometry of multi-Dirac structures. After recalling the basic definitions, we introduce a graded multiplication and a multi-Courant bracket on the space of sections of a multi-Dirac structure, so that the space of sections has the structure of a Gerstenhaber algebra. We then show that the graph of a k-form on a manifold gives rise to a multi-Dirac structure and also that this multi-Dirac structure is integrable if and only if the corresponding form is closed. Finally, we show that the multi-Courant bracket endows a subset of the ring of differential forms with a graded Poisson bracket, and we relate this bracket to some of the multisymplectic brackets found in the literature.

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