arXiv2026
Wigner's unitary representation of the Lorentz group is extended to a representation of the complex orthosymplectic Lie supergroup (\operatorname{OSp}_{\mathbb C}(1|2)) acting on Minkowski ((3,1|4))-dimensional superspace essentially by Hermitian conjugation. The invariant quadratic form is[x_1x_2-x\bar x+ϕψ+\barϕ\barψ]in Wigner's real coordinates (x_1,x_2) and complex coordinate (x), where (ϕ) and (ψ) are Dirac fermions. The extended action is linear in the superspace variables, but not quadratic in the odd group variables, and is described by an explicit even purely imaginary auxiliary parameter defined on the product of the Lie supergroup with its Lie algebra. This extension of Wigner's representation opens the door to the study of geometry in super hyperbolic three-space, initiated here with foundations on super geodesics, triangles, and tetrahedra, together with an analysis of ideal tetrahedra and a discussion of the nonzero fermionic correction to the Schläfli formula. This version includes a corrigendum that does not materially affect the main results, except for the claimed divergence of the volume of an ideal tetrahedron: the earlier divergence computation was correct as a calculation, but was carried out for an incorrect differential form.