Dual conformal invariant kinematics and folding of Grassmannian cluster algebras

Abstract

Grassmannian manifolds $\Gr(4,n)$ are closely related to the kinematic space of $n$-particle scattering processes in $D=4$, and their combinatorial and geometric structures have played an important role in the study of conformal invariant theories and scattering amplitudes. He, Li, and Yang \cite{HLY26} observed that restricting $D=4$ kinematics to a $D=3$ subspace can be interpreted as a folding of the Grassmannian cluster algebra $\CC[\Gr(4,n)]$ for $n\le 8$. In this paper, we derive general expressions for the $D=3$ kinematic constraints in terms of Plücker coordinates of $\Gr(4,n)$ directly from the three-dimensional kinematic condition. We then construct a family of foldable seeds for $\CC[\Gr(4,n)]$, obtained explicitly from the standard initial seed by mutation, whose folding conditions reproduce these kinematic constraints. This establishes the connection between $D=3$ kinematics and folding of Grassmannian cluster algebras for general $n$.

21 pages, 2 figures