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Journal Article

Astheno–Kähler and balanced structures on fibrations


Grantcharov,  Gueo
Max Planck Institute for Mathematics, Max Planck Society;

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Fino, A., Grantcharov, G., & Vezzoni, L. (2019). Astheno–Kähler and balanced structures on fibrations. International Mathematics Research Notices, 2019(22), 7093-7117. doi:10.1093/imrn/rnx337.

Cite as: https://hdl.handle.net/21.11116/0000-0005-1EA4-1
We study the existence of three classes of Hermitian metrics on certain types of compact complex manifolds. More precisely, we consider balanced, strong Kähler with torsion (SKT), and astheno-Kähler metrics. We prove that the twistor spaces of compact hyperkähler and negative quaternionic-Kähler manifolds do not admit astheno-Kähler metrics. Then we provide a construction of astheno-Kähler structures on torus bundles over Kähler manifolds leading to new examples. In particular, we find examples of compact complex non-Kähler manifolds which admit a balanced and an astheno-Kähler metric, thus answering to a question in [52] (see also [24]). One of these examples is simply connected. We also show that the Lie groups SU(3) and G2 admit SKT and astheno-Kähler metrics, which are different. Furthermore, we investigate the existence of balanced metrics on compact complex homogeneous spaces with an invariant volume form, showing in particular that if a compact complex homogeneous space M with invariant volume admits a balanced metric, then its first Chern class c1(M) does not vanish. Finally we characterize Wang C-spaces admitting SKT metrics.