Spectral-measure decay conjecture for uniformly discrete invariant random subgroups

From papers

Let GG be the Lie group under consideration, let kk be a degree, and let an IRS μ\mu of GG be ε\varepsilon-discrete in the sense used in the source. Let νμk\nu_\mu^k be the spectral measure associated with the degree-kk Laplace operator. Spectral-measure decay conjecture. For every kk and every ε>0\varepsilon>0, there exist positive constants CC and η0\eta_0 such that every ε\varepsilon-discrete IRS μ\mu satisfies

νμk((0,η])Clog(1/η)(0<η<η0).\nu_\mu^k((0,\eta])\leq\frac{C}{\log(1/\eta)}\quad(0<\eta<\eta_0).

Such a bound would prevent spectral mass from accumulating too rapidly near zero and would yield pointwise convergence at zero in situations where weak convergence alone is insufficient.

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Primary source

Miklos Abert, Nicolas Bergeron, Ian Biringer, Tsachik Gelander, Nikolay Nikolov, Jean Raimbault and Iddo Samet, “On the growth of L^2-invariants for sequences of lattices in Lie groups”, arXiv:1210.2961 (2017).

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