离散曲线$\ell^p$ -改进问题的亚临界估计
Some subcritical estimates for the $\ell^p$-improving problem for discrete curves
摘要:
我们应用基督的方法的改进$\ell^p$ -改进问题的离散平均值$\mathcal{A}_N$沿多项式曲线在$\mathbb{Z}^d$。结合某些特殊丢番图方程组解的个数的初等估计,得到了次临界区平均值$\mathcal{A}_N$的限制弱型$p \to p'$估计.这里得到的常数对$N$的依赖性是尖锐的,除了可能的$ε$ -损失。
英文摘要:
We apply Christ's method of refinements to the $\ell^p$-improving problem for discrete averages $\mathcal{A}_N$ along polynomial curves in $\mathbb{Z}^d$. Combined with certain elementary estimates for the number of solutions to certain special systems of diophantine equations, we obtain some restricted weak-type $p \to p'$ estimates for the averages $\mathcal{A}_N$ in the subcritical regime. The dependence on $N$ of the constants here obtained is sharp, except maybe for an $ε$-loss.
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