Subpolynomial restriction norm conjecture for geodesic circles

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Let XX be the compact hyperbolic surface, let OO be the inverse image under the natural projection of a fixed geodesic circle in the associated surface YY, and let UΛU_{\Lambda} be the corresponding eigenspace with restriction Hermitian form HΛH_{\Lambda}. For every ε>0\varepsilon>0, let AΛ,εA_{\Lambda,\varepsilon} be a constant such that

HΛ(f)≤AΛ,ε∥f∥Wε(X)2H_{\Lambda}(f)\leq A_{\Lambda,\varepsilon}\lVert f\rVert_{W^{\varepsilon}(X)}^2

for all f∈UΛf\in U_{\Lambda}.

Subpolynomial restriction norm conjecture. For any fixed ε>0\varepsilon>0 and every ϵ>0\epsilon>0,

AΛ,ε≪∣Λ∣ϵ.A_{\Lambda,\varepsilon}\ll |\Lambda|^{\epsilon}.

This is suggested by quantum chaos intuition and would give a subpolynomial bound for the norm of the restriction map from the eigenspace to the fixed lifted geodesic circle. The source does not provide evidence that this conjecture has been proved or disproved.

References

Primary source

Andre Reznikov, “Geodesic restrictions for the Casimir operator”, arXiv:1012.2853 (2011).

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