Bourgain–Sarnak–Rudnick-type conjecture for shrinking almost-round regions

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Assume n=3n=3 and m∈Sm\in S. Let AmA_m be a family of sets on the sphere depending on mm. Suppose there are absolute constants c1c_1 and c2c_2 such that AmA_m contains a spherical cap of radius c1σ(Am)1/2c_1\sigma(A_m)^{1/2} and is contained in a spherical cap of radius c2σ(Am)1/2c_2\sigma(A_m)^{1/2}. Suppose also that, for some δ>0\delta>0,

r(m)−1+δ≲σ(Am)≲r(m)−δ.r(m)^{-1+\delta}\lesssim \sigma(A_m)\lesssim r(m)^{-\delta}.

Bourgain–Sarnak–Rudnick-type conjecture. For every ϵ>0\epsilon>0,

∫SO(3)Δ2(gAm),dg=O(mϵr(m)−1σ(Am)).\int_{SO(3)}\Delta^2(gA_m)\\,dg=O\left(m^\epsilon r(m)^{-1}\sigma(A_m)\right).

This extends the Bourgain–Sarnak–Rudnick estimate for shrinking spherical caps and segments to more general shrinking regions, and is intended to improve the arithmetic coupling result in dimension three. Its resolution status is not specified in the supplied text.

References

Primary source

Dmitry Beliaev and Riccardo W. Maffucci, “Coupling of stationary fields with application to arithmetic waves”, arXiv:1912.09470 (2019).

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