Reznikov's Fourier coefficient conjecture for restrictions to geodesics

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 0ν/λc<10\leq\nu/\lambda\leq c<1, one has

γpereλ(γper(s))eiνsdsCελ12+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.

Sources & referencesView supporting material

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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