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arXiv math/9911153math.CA
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具有C^ \infty相位的振荡积分算子的L^2界

Sharp L^2 bounds for oscillatory integral operators with C^\infty phases

Vyacheslav Rychkov

摘要:

设T是L^2(R)上的振荡积分算子,具有光滑实相函数S(x,y).我们证明,在除了下面描述的情况之外的所有情况下,在定位到原点的一个小邻域之后,T的范数像N^{-d/2}一样随着频率N->infty而衰减,其中d是Phong和Stein引入的牛顿衰减率,由S(x,y)的牛顿图确定。对于实解析相函数,这个结果由Phong和Stein证明。对于光滑的相位函数,迄今为止最著名的结果包含指数中的损失(隐含在西格的工作中)。当混合偏导数S“”(x,y)的泰勒级数在R[[x,y]]中分解为U(x,y)(y-f(x))^k时,会发生上述例外情况,其中U(x,y)是单位,k \ge 2,f(x)是R[[x]]中的级数,形式为Cx+(高阶),C \ne 0。在这种情况下,我们证明一个估计损失的一个权力的log N。

英文摘要:

Let T be an oscillatory integral operator on L^2(R) with a smooth real phase function S(x,y). We prove that, in all cases but the one described below, after localization to a small neighborhood of the origin the norm of T decays like N^{-d/2} as the frequency N->infty, where d is the Newton decay rate introduced by Phong and Stein, which is determined by the Newton diagram of S(x,y). For real analytic phase functions this result was proved by Phong and Stein. For smooth phase functions the best known results so far contained a loss of epsilon in the exponent (implicit in the work of Seeger). The exceptional case mentioned above happens when the Taylor series of the mixed partial derivative S''(x,y) factorizes in R[[x,y]] as U(x,y)(y-f(x))^k, where U(x,y) is a unit, k\ge 2, and f(x) is a series in R[[x]] of the form Cx+(higher order), C\ne 0. In this case we prove an estimate with a loss of of a power of log N.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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