Year: 2026
Type: preprint
Abstract: We classify regular cyclic scalar invariants of non-degenerate hyperbolic ${\mathcal N}=1$ spin supertriangles which are additive under geodesic subdivision. After fixing the spin lift, the common-first gauge (introduced in earlier work by the second-named author and further developed here) gives a complete $3|4$ modulus of such supertriangles.. The space of additive scalar invariants is proved to have superdimension $3|1$: ordinary hyperbolic area in degree zero, two even generators in degree two, and one odd generator in degree three; the degree-one and degree-four sectors vanish. One degree-two generator is the fermionic first variation of body area, equivalently the nilpotent correction from ordinary body angle defect to super angle defect. The degree-three generator changes sign under reversal of the spin lift, while the other generators are fixed, so ordinary supertriangles carry only three even invariants.
Source: arXiv (Cornell University)
Authors: Gaiur, Ilia, Penner, Robert
Institution: Institut des Hautes Études Scientifiques
Language: English
Topic: Mathematics and Applications
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222938545