The group-ring resolution conjecture for symmetric spaces

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Let M~d\widetilde M^d be a symmetric space with curvature −1≤K≤0-1\leq K\leq 0 and real rank rr. Let GG act on M~\widetilde M, and suppose there is a minimum displacement greater than f(n)f(n), meaning

d(gx,x)>f(n)d(gx,x)>f(n)

for every x∈M~x\in\widetilde M and every 1≠g∈G1\neq g\in G.

Group-ring resolution conjecture. There is a function f(n)f(n) such that every nn-generated ideal in K[G]\mathbb K[G] has a free resolution of length r−1r-1.

Such a resolution property would imply, via the methods of the paper, kk-cellular waist inequalities for maps from uniform locally symmetric spaces of real rank rr whenever 0<k<d−m−(r−1)0<k<d-m-(r-1). The conjecture extends the hyperbolic-space case, where the corresponding group-ring ideals are free.

References

Primary source

Grigori Avramidi and Thomas Delzant, “Cellular waists of hyperbolic spaces”, arXiv:2606.13585 (2026).

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