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Cohomologie tangente et cup-produit pour la quantification de Kontsevich

Dominique Manchon, Charles Torossian (2003)

Annales mathématiques Blaise Pascal

On a flat manifold M = d , M. Kontsevich’s formality quasi-isomorphism is compatible with cup-products on tangent cohomology spaces, in the sense that for any formal Poisson 2 -tensor γ the derivative at γ of the quasi-isomorphism induces an isomorphism of graded commutative algebras from Poisson cohomology space to Hochschild cohomology space relative to the deformed multiplication built from γ via the quasi-isomorphism. We give here a detailed proof of this result, with signs and orientations precised....

Collapse of warped submersions

Szymon M. Walczak (2006)

Annales Polonici Mathematici

We generalize the concept of warped manifold to Riemannian submersions π: M → B between two compact Riemannian manifolds ( M , g M ) and ( B , g B ) in the following way. If f: B → (0,∞) is a smooth function on B which is extended to a function f̂ = f ∘ π constant along the fibres of π then we define a new metric g f on M by g f | × g M | × , g f | × T M ̂ f ̂ ² g M | × T M ̂ , where and denote the bundles of horizontal and vertical vectors. The manifold ( M , g f ) obtained that way is called a warped submersion. The function f is called a warping function. We show a necessary...

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