Squiggly-and-double-edge formula for cosmological polytopes

Let GG be a graph, let CG\mathbb{C}_G be its cosmological polytope, and let TT be a triangulation of CG\mathbb{C}_G arising from a good term order on RGR_G. For each simplex STS\in T, let GSG_S be its associated graph, and let sq(GS)\operatorname{sq}(G_S) and db(GS)\operatorname{db}(G_S) denote respectively the numbers of squiggly and double edges in GSG_S. Squiggly-and-double-edge formula.

h(CG;z)=STzsq(GS)+db(GS).h^*(\mathbb{C}_G;z)=\sum_{S\in T}z^{\operatorname{sq}(G_S)+\operatorname{db}(G_S)}.

The formula is proposed as a general expression supported by the preceding visibility results for cycles and trees. The supplied text gives no proof or resolution, so its validity for all graphs and all triangulations arising from good term orders remains open.

Sources & referencesView supporting material

Primary source

Justus Bruckamp, Lina Goltermann, Martina Juhnke, Erik Landin and Liam Solus, “Ehrhart theory of cosmological polytopes”, arXiv:2412.01602 (2025).

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