Reznikov's Fourier coefficient conjecture for restrictions to geodesics

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Let (M,g)(M,g) be a compact hyperbolic surface, let eλe_\lambda be an eigenfunction of −Δg\sqrt{-\Delta_g} with eigenvalue λ\lambda, and let γ\gamma be a closed geodesic or a geodesic circle, parametrized by arc length as γper(s)\gamma_{per}(s). Given ε>0\varepsilon>0 and 0<c<10<c<1, let CεC_\varepsilon depend on ε\varepsilon, MM, and the length of γper\gamma_{per}. Reznikov's Fourier coefficient conjecture. Whenever 0≤ν/λ≤c<10\leq\nu/\lambda\leq c<1, one has

∣∫γpereλ(γper(s))e−iνs ds∣≤Cελ−12+ε.\left|\int_{\gamma_{per}}e_\lambda(\gamma_{per}(s))e^{-i\nu s}\,ds\right|\leq C_\varepsilon\lambda^{-\frac12+\varepsilon}.

This conjecture predicts power savings over the logarithmic Fourier-coefficient estimate stated immediately before it. The supplied text gives no evidence of resolution.

References

Primary source

Emmett L. Wyman and Yakun Xi, “Improved Generalized Periods Estimates Over Curves on Riemannian Surfaces with Nonpositive Curvature”, arXiv:1807.00041 (2018).

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