arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2109.07941math.DS
收藏

Hardy场序列的联合遍历性

Joint ergodicity of Hardy field sequences

Konstantinos Tsinas

摘要:

研究了多重遍历平均的平均收敛性,其中迭代由属于Hardy域的多项式增长的光滑函数产生。我们的结果包括所有多项式增长的微指数函数,如函数$t^{3/2}, t\log t$和$e^{\sqrt{\log t}}$ .证明了如果函数$a_1,...,a_k$的所有非平凡线性组合都远离有理多项式,则遍历平均值$\frac{1}{N} \sum_{n=1}^{N}f_1(T^{\lfloor{a_1(n)}\rfloor}x)\cdots f_k(T^{\lfloor{a_k(n)}\rfloor}x)$的$L^2$ -极限存在且等于遍历系统中函数$f_1,...,f_k$的积分的乘积,从而建立了Frantzikinakis的一个猜想.在函数$a_1,...,a_k$的一些更一般的条件下,我们还找到了上述平均值收敛的特征因子,并导出了弱混合系统的一个收敛结果。

英文摘要:

We study mean convergence of multiple ergodic averages, where the iterates arise from smooth functions of polynomial growth that belong to a Hardy field. Our results include all logarithmico-exponential functions of polynomial growth, such as the functions $t^{3/2}, t\log t$ and $e^{\sqrt{\log t}}$. We show that if all non-trivial linear combinations of the functions $a_1,...,a_k$ stay logarithmically away from rational polynomials, then the $L^2$-limit of the ergodic averages $\frac{1}{N} \sum_{n=1}^{N}f_1(T^{\lfloor{a_1(n)}\rfloor}x)\cdots f_k(T^{\lfloor{a_k(n)}\rfloor}x)$ exists and is equal to the product of the integrals of the functions $f_1,...,f_k$ in ergodic systems, which establishes a conjecture of Frantzikinakis. Under some more general conditions on the functions $a_1,...,a_k$, we also find characteristic factors for convergence of the above averages and deduce a convergence result for weak-mixing systems.

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。

↑