Invariant Polynomials on complexified bundles with connection

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SUMMARY

The discussion centers on the relationship between curvature forms of a real vector bundle and its complexification. It establishes that the curvature forms of the complexified bundle are identical to those of the original real bundle. Consequently, the Pontryagin forms derived from the invariant polynomials in these curvature forms are also equivalent to those of the real curvature forms. Specifically, for an oriented real 2-plane bundle with a connection compatible with a metric, the first Pontryagin class is the square of the curvature 2-form, while the first Chern polynomial is zero.

PREREQUISITES
  • Understanding of vector bundles and connections
  • Familiarity with curvature forms in differential geometry
  • Knowledge of Pontryagin classes and Chern polynomials
  • Concept of complexification of vector bundles
NEXT STEPS
  • Study the properties of curvature forms in differential geometry
  • Explore the relationship between Pontryagin classes and Chern classes
  • Learn about the process of complexification of vector bundles
  • Investigate the implications of metric compatibility in vector bundles
USEFUL FOR

Mathematicians, differential geometers, and theoretical physicists interested in vector bundles, curvature forms, and their applications in topology and geometry.

lavinia
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I would like to know if the following correct.

Suppose I start with a connection on a real vector bundle and extend it to the complexification of the bundle.

The curvature forms of the complexification seem to be the same as curvature 2 forms of the real bundle.

From this it seems that the Pontryagin forms derived from the invariant polynomials in the curvature forms are just are the same as for the real curvature forms.

So for instance for an oriented real 2 plane bundle with a connection that is compatible with a metric on the bundle, the first Pontryagin class would be the square of the curvature 2 form and the first Chern polynomial would be zero.
 
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