Pseudo-Dirac Structures

Abstract

A Dirac structure is a Lagrangian subbundle of a Courant algebroid, $L\subset \mathbb{E}$, which is involutive with respect to the Courant bracket. In particular, $L$ inherits the structure of a Lie algebroid. In this paper, we introduce the more general notion of a pseudo-Dirac structure: an arbitrary subbundle, $W\subset \mathbb{E}$, together with a pseudo-connection on its sections, satisfying a natural integrability condition. As a consequence of the definition, $W$ will be a Lie algebroid. Allowing non-isotropic subbundles of $\mathbb{E}$ incorporates non-skew tensors and connections into Dirac geometry. Novel examples of pseudo-Dirac structures arise in the context of quasi-Poisson geometry, Lie theory, generalized Kähler geometry, and Dirac Lie groups, among others. Despite their greater generality, we show that pseudo-Dirac structures share many of the key features of Dirac structures. In particular, they behave well under composition with Courant relations.

References in corpus (8)

• Courant algebroids, derived brackets and even symplectic supermanifolds
• Higher vector bundles and multi-graded symplectic manifolds
• Some title containing the words "homotopy" and "symplectic", e.g. this one
• Quasi-Hamiltonian groupoids and multiplicative Manin pairs
• Double Lie algebroids and the double of a Lie bialgebroid
• Multiplicative Dirac structures on Lie groups
• LA-Courant algebroids and their applications
• Multiplicative Forms and Spencer Operators