A Vector Field Method on the Distorted Fourier Side and Decay for Wave Equations with PotentialsAuthor :
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Published : Saturday 30 April 2016
Description
The authors study the Cauchy problem for the one-dimensional wave equation â^, 2 t u (t , x) â^ â^, 2 x u (t , x) V (x)u (t , x) = 0. The potential V is assumed to be smooth with asymptotic behavior V (x) â^¼ â^ 1 4 |x|â^2 as |x| â+â^z. They derive dispersive estimates, energy estimates, and estimates involving the scaling vector field t â^,t xâ^,x , where the latter are obtained by employing a vector field method on the â?odistortedâ?? Fourier side. In addition, they prove local energy decay estimates. Their results have immediate applications in the context of geometric evolution problems. The theory developed in this paper is fundaA-mental for the proof of the co-dimension 1 stability of the catenoid under the vanishing mean curvature flow in Minkowski space; see Donninger, Krieger, Szeftel, and Wong, â?oCodimension one stability of the catenoid under the vanishing mean curvature flow in Minkowski spaceâ??, preprint arXiv:1310.5606 (2013).
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