Year: 2026
Type: preprint
Abstract: We study compact non-Kähler Bismut Hermitian-Einstein threefolds endowed with an automorphism group acting with cohomogeneity one. We prove that the Lie algebra of this group is isomorphic to $\mathbb{R}^3\oplus\mathfrak{su}(2)$ or $\mathbb R^2\oplus\mathfrak{su}(2)$, provided that the Bismut connection is not flat. In the first case, we explicitly describe all these structures up to homothety and biholomorphic isometry. We also construct explicit families of complete non-compact examples. The resulting non-Bismut-flat threefolds have non-constant scalar curvature and restricted Bismut holonomy $T^1\subset \mathrm{SU}(3)$, and include examples on $S^3\times S^3$ and complete examples on $S^3\times S^1\times\mathbb{R}^2$. Finally, we construct a smooth deformation of a Bismut-flat Samelson structure on $S^3\times S^3$ through non-Bismut-flat Bismut Hermitian-Einstein structures whose complex structures are not compatible with any Bismut-flat metric.
Source: arXiv (Cornell University)
Authors: Podestà, Fabio, Raffero, Alberto
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7224077044