Caputo's hypergraph conjecture for symmetric-group representations

Let Γ=([n],w)\Gamma=([n],w) be a weighted hypergraph on [n][n], with non-negative weights, and let ρ\rho be a non-trivial irreducible representation of Sym(n)\mathrm{Sym}(n). Write π(n1,1)\pi_{(n-1,1)} for the standard representation minus the trivial representation, and let λmin(Γ,ρ)\lambda_{\min}(\Gamma,\rho) denote the smallest eigenvalue associated with ρ\rho. Caputo's hypergraph conjecture. For every such Γ\Gamma and ρ\rho,

λmin(Γ,π(n1,1))λmin(Γ,ρ).\lambda_{\min}(\Gamma,\pi_{(n-1,1)})\leq\lambda_{\min}(\Gamma,\rho).

This generalizes the known theorem for measures supported on transpositions. The conjecture is still open in general.

Sources & referencesView supporting material

Primary source

Gil Alon and Doron Puder, “Aldous-type Spectral Gaps in Unitary Groups”, arXiv:2603.00353 (2026).

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