Riv. Mat. Univ. Parma, to appear

Dan Popovici [a]

Albanese Map and Self-Duality of the Iwasawa Manifold

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Abstract: We prove that the three-dimensional Iwasawa manifold $$X$$, viewed as a locally holomorphically trivial fibration by elliptic curves over its two-dimensional Albanese torus, is self-dual in the sense that the base torus identifies canonically with its dual torus, the Jacobian torus of $$X$$, under a sesquilinear duality, while the fibre identifies with itself. To this end, we derive elements of Hodge theory for arbitrary sGG manifolds, introduced in earlier joint work of the author with L. Ugarte as those compact complex manifolds on which all the Gauduchon metrics are strongly Gauduchon, to construct in an explicit way the Albanese torus and map of any sGG manifold. These definitions coincide with the classical ones in the special Kähler and $$\partial\bar\partial$$ (i.e. satisfying the $$\partial\bar\partial$$-lemma) cases. The generalisation to the larger sGG class is made necessary by the Iwasawa manifold being an sGG, non-$$\partial\bar\partial$$, manifold. The main result of this paper can be seen as a complement from a different perspective to the author's very recent work where a non-Kähler mirror symmetry of the Iwasawa manifold was emphasised. We also hope that it will suggest yet another approach to non-Kähler mirror symmetry for different classes of manifolds.