Abstract
Let P … i ! M be an oriented S 2 -flber bundle over a closed manifold M and let Q be its associated SO(3)-bundle, then we investigate the ring structure of the cohomology of the total space P by constructing the coupling form ?A induced from an SO(3) connection A. We show that the cohomology ring of total space splits into those of the base space and the flber space if and only if the Pontrjagin class p1(Q) 2 H 4 (M;Z) vanishes. We apply this result to the twistor spaces of 4-manifolds.
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