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Remarks on the product of harmonic forms

A metric is formal if all products of harmonic forms are again harmonic. The existence of a formal metric implies Sullivan formality of the manifold, and hence formal metrics can exist only in presence of a very restricted topology. We show that a warped product metric is formal if and only if the warping function is constant and derive further topological obstructions to the existence of formal metrics. In particular, we determine necessary and sufficicient conditions for a Vaisman metric to be formal.

preprint2010arXivOpen access
Liviu OrneaMihaela Pilca
math.DG
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Liviu OrneaMihaela Pilca

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