Riv. Mat. Univ. Parma, to appear

Houda Bellitir[a] and Dan Popovici[b]

Positivity cones under deformations of complex structures

Keywords: Frölicher spectral sequence; deformations of complex structures; positivity; $$\partial\bar\partial$$-manifolds; strongly Gauduchon (sG) metrics; sGG manifolds.
Abstract: We investigate connections between the sGG property of compact complex manifolds, defined in earlier work by the second author and L. Ugarte by the requirement that every Gauduchon metric be strongly Gauduchon, and a possible degeneration of the Frölicher spectral sequence. In the first approach that we propose, we prove a partial degeneration at $$E_2$$ and we introduce a positivity cone in the $$E_2$$-cohomology of bidegree $$(n-2,\,n)$$ of the manifold that we then prove to behave lower semicontinuously under deformations of the complex structure. In the second approach that we propose, we introduce an analogue of the $$\partial\bar\partial$$-lemma property of compact complex manifolds for any real non-zero constant $$h$$ using the partial twisting $$d_h$$, introduced recently by the second author, of the standard Poincaré differential $$d$$. We then show, among other things, that this $$h$$-$$\partial\bar\partial$$-property is deformation open.