Mathematics – Algebraic Topology
Scientific paper
2004-11-02
Mathematics
Algebraic Topology
10 pages, LaTeX 2e, Introduction revised
Scientific paper
The groups of differential characters of Cheeger and Simons admit a natural multiplicative structure. The map given by the squares of degree 2k differential characters reduces to a homomorphism of ordinary cohomology groups. We prove that the homomorphism factors through the Steenrod squaring operation of degree 2k. A simple application shows that five-dimensional Chern-Simons theory for pairs of B-fields is SL(2, Z)-invariant on spin manifolds.
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