Some Exotic Characteristic Homomorphism for Lie Algebroids

Details Some Exotic Characteristic Homomorphism for Lie Algebroids Some Exotic Characteristic Homomorphism for Lie Algebroids

2011-01-31

arxiv.org/abs/1102.0022v3

Mathematics

Differential Geometry

13 pages

Scientific paper

The authors define some secondary characteristic homomorphism for the triple (A,B,\bigtriangledown), in which B\subset A is a pair of regular Lie algebroids over the same foliated manifold and \bigtriangledown:L\rightarrow A is a homomorphism of Lie algebroids (i.e. a flat L-connection in A) where L is an arbitrary (not necessarily regular) Lie algebroid and show that characteristic classes from its image generalize known exotic characteristic classes for flat regular Lie algebroids (Kubarski) and flat principal fibre bundles with a reduction (Kamber, Tondeur). The generalization includes also the one given by Crainic for representations of Lie algebroids on vector bundles. For a pair of regular Lie algebroids B \subset A and for the special case of the flat connection id:A\rightarrow A we obtain a characteristic homomorphism which is universal in the sense that it is a factor of any other one for an arbitrary flat L-connection \bigtriangledown:L\rightarrow A.

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