Holomorphic forms of geometrically formal Kaehler manifolds

Abstract

We investigate harmonic forms of geometrically formal metrics, which are defined as those having the exterior product of any two harmonic forms still harmonic. We prove that a formal Sasakian metric can exist only on a real cohomology sphere and that holomorphic forms of a formal K"ahler metric are parallel w.r.t. the Levi-Civita connection. In the general Riemannian case a formal metric with maximal second Betti number is shown to be flat . Finally we prove that a six-dimensional manifold with $b_1 neq 1, b_2 ge 3$ and not having the cohomology algebra of $mathbb{T}^3 times S^3$ carries a symplectic structure as soon as it admits a formal metric.