A maximal inequality for the tail of the bilinear Hardy-Littlewood function

Details A maximal inequality for the tail of the bilinear Hardy-Littlewood function A maximal inequality for the tail of the bilinear Hardy-Littlewood function

2007-12-06

arxiv.org/abs/0712.0989v2

Mathematics

Dynamical Systems

This is the final and simplified version of the paper previously uploaded with the same title. The paper has been refereed and

Scientific paper

Let $(X,\mathcal{B}, \mu, T)$ be an ergodic dynamical system on a non-atomic finite measure space. We assume without loss of generality that $\mu(X)=1.$ Consider the maximal function $\dis R^*:(f, g) \in L^p\times L^q \to R^*(f, g)(x) = \sup_{n\geq 1} \frac{f(T^nx)g(T^{2n}x)}{n}.$ We obtain the following maximal inequality. For each $10,$ and nonnegative functions $f\in L^p$ and $g\in L^1$ \mu\{x: R^*(f,g)(x)>\lambda\} \leq C_p \bigg(\frac{\|f\|_p\|g\|_1}{\lambda}\bigg)^{1/2}. We also show that for each $\alpha>2$ the maximal function $R^*(f,g)$ is a.e. finite for pairs of functions $(f,g)\in (L(\log L)^{2\alpha}, L^1)$.

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