arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2403.12751math.CA
收藏

振荡积分与加权梯度流

Oscillatory integrals and weighted gradient flows

Michael Greenblatt

AI总结:

本研究提出沿加权梯度方向分部积分估计标量振荡积分的方法,证明了关于相位线性扰动一致的估计定理,推导了拟齐次相位下的曲面测度傅里叶变换估计,并给出Varchenko振荡积分估计推广到曲面测度傅里叶变换的新证明。

摘要:

我们研究通过沿由$(x_1 \partial_{x_1} f(x) ,..., x_n \partial_{x_n}f(x))$(其中$f(x)$为相位函数)确定的方向分部积分,来估计标量振荡积分的方法。我们证明了一个定理,该定理给出的估计关于相位的线性扰动是一致的,并探究了若干推论。当相位函数是拟齐次的时,该定理给出了相关曲面测度傅里叶变换的估计,其结果通常与最优估计差距不大。此外,该定理提供了一种(至多到端点的)新证明,即著名的Varchenko[V]振荡积分估计——当相位函数的牛顿多面体非退化时成立——可推广至指数小于$\frac{1}{2}$时曲面测度傅里叶变换的对应界,该结论的最优版本最初在[G2]中得到证明。

英文摘要:

We investigate estimating scalar oscillatory integrals by integrating by parts in directions based on $(x_1 \partial_{x_1} f(x) ,..., x_n \partial_{x_n}f(x))$, where $f(x)$ is the phase function. We prove a theorem which provides estimates that are uniform with respect to linear perturbations of the phase and investigate some consequences. When the phase function is quasi-homogeneous the theorem gives estimates for the associated surface measure Fourier transforms that are generally not too far off from being sharp. In addition, the theorem provides a new proof, up to endpoints, that the well-known oscillatory integral estimates of Varchenko [V] when the Newton polyhedron of the phase function is nondegenerate extend to corresponding bounds for surface measure Fourier transforms when the index is less than $\frac{1}{2}$. A sharp version of this was originally proven in [G2].

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。

↑