Symplectic frame bundle

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In symplectic geometry, the symplectic frame bundle[1] of a given symplectic manifold (M,ω) is the canonical principal Sp(n,ℝ)-subbundle π𝐑:𝐑M of the tangent frame bundle FM consisting of linear frames which are symplectic with respect to ω. In other words, an element of the symplectic frame bundle is a linear frame uFp(M) at point pM, i.e. an ordered basis (𝐞1,,𝐞n,𝐟1,,𝐟n) of tangent vectors at p of the tangent vector space Tp(M), satisfying

ωp(𝐞j,𝐞k)=ωp(𝐟j,𝐟k)=0 and ωp(𝐞j,𝐟k)=δjk

for j,k=1,,n. For pM, each fiber 𝐑p of the principal Sp(n,ℝ)-bundle π𝐑:𝐑M is the set of all symplectic bases of Tp(M).

The symplectic frame bundle π𝐑:𝐑M, a subbundle of the tangent frame bundle FM, is an example of reductive G-structure on the manifold M.

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