In mathematics, a Fedosov manifold is a symplectic manifold with a compatible torsion-free connection, that is, a triple (M, ω, ∇), where (M, ω) is a symplectic manifold (that is, ω {\displaystyle \omega } is a symplectic form, a non-degenerate closed exterior 2-form, on a C ∞ {\displaystyle C^{\infty }} -manifold M), and ∇ is a symplectic torsion-free connection on M . {\displaystyle M.} (A connection ∇ is called compatible or symplectic if X ⋅ ω(Y,Z) = ω(∇XY,Z) + ω(Y,∇XZ) for all vector fields X,Y,Z ∈ Γ(TM). In other words, the symplectic form is parallel with respect to the connection, i.e., its covariant derivative vanishes.) Note that every symplectic manifold admits a symplectic torsion-free connection. Cover the manifold with Darboux charts and on each chart define a connection ∇ with Christoffel symbol Γ j k i = 0 {\displaystyle \Gamma _{jk}^{i}=0} . Then choose a partition of unity (subordinate to the cover) and glue the local connections together to a global connection which still preserves the symplectic form. The famous result of Boris Vasilievich Fedosov gives a canonical deformation quantization of a Fedosov manifold.
Examples For example, R 2 n {\displaystyle \mathbb {R} ^{2n}} with the standard symplectic form d x i ∧ d y i {\displaystyle dx_{i}\wedge dy_{i}} has the symplectic connection given by the exterior derivative d . {\displaystyle d.} Hence, ( R 2 n , ω , d ) {\displaystyle \left(\mathbb {R} ^{2n},\omega ,d\right)} is a Fedosov manifold.
References
Esrafilian, Ebrahim; Hamid Reza Salimi Moghaddam (2013). "Symplectic Connections Induced by the Chern Connection". arXiv:1305.2852 [math.DG].