The simplex-like compactification conjecture for cluster varieties

Let YY be a cluster variety that is locally acyclic and of full rank. Write Y>0Y_{>0} for its positive part and Ω(Y>0)\Omega(Y_{>0}) for its natural top form. The simplex-like compactification conjecture. There is a compactification XX of YY such that (X,X0)(X,X_{\geq 0}) is a simplex-like positive geometry satisfying

X>0=Y>0,Y=XX,X_{>0}=Y_{>0},\qquad Y=X\setminus\partial X, Ω(X0)=Ω(Y>0),\Omega(X_{\geq 0})=\Omega(Y_{>0}),

and each face positive geometry (C,C0)(C,C_{\geq 0}) of (X,X0)(X,X_{\geq 0}) is also a compactification of a cluster variety and its positive part. This would extend the positive-geometry structure seen in positroid and cluster-variety examples, but the existence of such compactifications with the stated face structure is not established in general.

Sources & referencesView supporting material

Primary source

Thomas Lam, “An invitation to positive geometries”, arXiv:2208.05407 (2022).

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