For convex analytic finite-type hypersurfaces, the square-root curvature damped Fourier transform decays at the optimal rate |ξ|^{-d/2} for d=2,3, and with a logarithmic loss for d=4.
Uniform Oscillatory Integral estimates for Convex Phases via Sublevel Set estimates
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abstract
We examine the relation between oscillatory integral estimates and sublevel set estimates associated to convex functions. Whilst the former implies the latter in many cases, the reverse requires additional assumptions. Under finite (line) type assumptions, Bruna, Nagel & Wainger were able to demonstrate a very precise control of oscillatory integrals with convex phases via their sublevel sets. Without the finite type assumption, certain erratic behaviour can force this precise control to fail (Bak, McMichael, Vance & Wainger). We establish the same precise control under an alternative qualitative geometric assumption.
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Damping oscillatory Integrals of convex analytic functions
For convex analytic finite-type hypersurfaces, the square-root curvature damped Fourier transform decays at the optimal rate |ξ|^{-d/2} for d=2,3, and with a logarithmic loss for d=4.