Invariant complex structures on the Euclidean motion group as deformations of Calabi-Eckmann structures
Year: 2026
Type: preprint
Abstract: We classify, up to equivalence, all left-invariant complex structures on the three-dimensional Euclidean rigid motion group $SE(3).$ Our approach is based on the correspondence between complex structures on a real Lie algebra $\mathfrak{e}(3)$ of the motion group and complex Lie subalgebras of the complexification of $\mathfrak{e}(3).$ The resulting structures form a one-parameter family $J_ϕ.$ We further establish a connection with the classical Calabi-Eckmann complex structures on $S^3\times S^3.$ More precisely, we construct a one-parameter deformation of Lie brackets connecting $\mathfrak{so}(3)\oplus \mathfrak{so}(3)$ to $\mathfrak{e}(3),$ for which each endomorphism $J_ϕ$ remains integrable. Consequently, every left-invariant complex structure on $SE(3)$ arises as a contraction limit of Calabi-Eckmann structures. The same family of endomorphisms also defines complex structures on $\mathfrak{so}(3,1).$
Source: arXiv (Cornell University)
Authors: Bokan, Neda, Vukmirovic, Srdjan
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222324550