# Tensor bundle

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of type on a differentiable manifold The vector bundle over associated with the bundle of tangent frames and having as standard fibre the space of tensors (cf. Tensor on a vector space) of type on , on which the group acts by the tensor representation. For instance, coincides with the tangent bundle over , while coincides with the cotangent bundle . In the general case, the tensor bundle is isomorphic to the tensor product of the tangent and cotangent bundles: Sections of the tensor bundle of type are called tensor fields of type and are the basic object of study in differential geometry. For example, a Riemannian structure on is a smooth section of the bundle the values of which are positive-definite symmetric forms. The smooth sections of the bundle form a module over the algebra of smooth functions on . If is a paracompact Hausdorff manifold, then where is the module of smooth vector fields, is the module of Pfaffian differential forms (cf. also Pfaffian form), and the tensor products are taken over . In classical differential geometry tensor fields are sometimes simply called tensors on .

How to Cite This Entry:
Tensor bundle. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Tensor_bundle&oldid=17758
This article was adapted from an original article by A.L. Onishchik (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article