Decay of the Fourier transform of surfaces with vanishing curvature

Erdos, Laszlo; Salmhofer, Manfred

Decay of the Fourier transform of surfaces with vanishing curvature

Authors

Description

We prove $L^p$-bounds on the Fourier transform of measures $μ$ supported on two dimensional surfaces. Our method allows to consider surfaces whose Gauss curvature vanishes on a one-dimensional submanifold. Under a certain non-degeneracy condition, we prove that $\whμ\in L^{4+β}$, $β>0$, and we give a logarithmically divergent bound on the $L^4$-norm. We use this latter bound to estimate almost singular integrals involving the dispersion relation, $e(p)= \sum_1^3 [1-\cos p_j]$, of the discrete Laplace operator on the cubic lattice. We briefly explain our motivation for this bound originating in the theory of random Schrödinger operators.
40 pages, 4 figures