Pre-Courant Algebroids

TL;DR

This paper explores the supermanifold framework for pre-Courant algebroids, generalizing Courant algebroids by relaxing the Jacobi identity, and introduces new structures like symplectic almost Lie 2-algebroids.

Contribution

It establishes a supermanifold description of pre-Courant algebroids, defines symplectic almost Lie 2-algebroids, and simplifies the study of weighted pre-Courant algebroids and VB-Courant algebroids.

Findings

Supermanifold description of pre-Courant algebroids

Introduction of symplectic almost Lie 2-algebroids

Simplified framework for weighted pre-Courant algebroids

Abstract

Pre-Courant algebroids are `Courant algebroids' without the Jacobi identity for the Courant-Dorfman bracket. In this paper we examine the corresponding supermanifold description of pre-Courant algebroids and some direct consequences thereof - such as the definition of (sub-)Dirac structures and the notion of the naive quasi-cochain complex. In particular we define symplectic almost Lie 2-algebroids and show how they correspond to pre-Courant algebroids. Moreover, the framework of supermanifolds allows us to economically define and work with pre-Courant algebroids equipped with a compatible non-negative grading. VB-Courant algebroids are natural examples of what we call weighted pre-Courant algebroids, and our approach drastically simplifies working with them. We remark that examples of pre-Courant algebroids are plentiful - natural examples include the cotangent bundle of any almost Lie algebroid.