Strongly Gauduchon conjecture for compact non-balanced BTP manifolds

Let (Mn,g)(M^n,g) be a compact Hermitian manifold satisfying the Bismut-parallel-torsion condition bTb=0\nabla^b T^b=0, and suppose that gg is non-balanced. A Hermitian metric is strongly Gauduchon if there exists a global (n,n2)(n,n-2)-form Ω\Omega such that

ωn1=Ω.\partial \omega^{n-1}=\overline{\partial}\Omega.

Strongly Gauduchon conjecture. The manifold MM does not admit any strongly Gauduchon metric. The claim extends the known obstruction for compact non-Kähler BKL manifolds; the source notes that it holds when BRic(Q)B\geq \operatorname{Ric}(Q), including the Vaisman case, but leaves the general statement as a conjecture.

Sources & referencesView supporting material

Primary source

Quanting Zhao and Fangyang Zheng, “Curvature characterization of Hermitian manifolds with Bismut parallel torsion”, arXiv:2407.10497 (2026).

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