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Multilinear Cesàro maximal operators

Authors: Bernardis, Ana Lucia; Crescimbeni, Raquel Liliana; Martín Reyes, Francisco Javier;

Multilinear Cesàro maximal operators

Abstract

The authors characterize weighted weak type and strong type inequalities for the maximal operator associated to the Cesàro-\(\alpha\) averages. Let \(\varphi_R(x)=\frac{1}{R^n}\varphi(\frac{x}{R})\), \(R>0\), be the dilated functions of a nonnegative integrable function \(\varphi\) defined on \(\mathbb{R}^n\) such that \(\int \varphi =1\). When \(\varphi(x)=\varphi^\alpha (x)=C_{n, \alpha}(1-|x|_{\infty})^{\alpha}\chi_{Q(0, 1)}(x)\), where \(x=(x_1, \cdots, x_n)\), \(|x|_{\infty}=\max_{1 \leq i \leq n}|x_i|\), \(-10} \frac{1}{|Q(x, R)|^{1+\alpha/n}}\int_{Q(x, R)}|f(y)|d(y, \partial Q(x, R))^{\alpha}dy. \] If \(\alpha =0\), \(M_\alpha^C \) is simply denoted by \(M^C\). A non-negative measurable function (a weight) \(\omega\) satisfies \(A_{p,a}\), \(-10\) such that \[ \Big (\int_Q \omega(y)dy \Big )^{1/p} \Big (\int_Q\omega^{1-p'}(y)d(y, \partial Q)^{\alpha p'} dy\Big)^{1/p'} \leq C|Q|^{1+\frac{\alpha}{n}}, \] for every cube \(Q\), where \(p'\) is the conjugate exponent of \(p\). Fix a natural number \(m>1\) and take real numbers \(p_i\) and \(\alpha_i\) with \(p_i>1\) and \(-10}\prod_{i=1}^m \frac{1}{|Q(x, R)|^{1+\alpha_i/n}}\int_{Q(x, R)}|f_i(y)|d(y, \partial Q(x, R))^{\alpha_i}dy. \] where \(\overrightarrow{f}=(f_1, \cdots, f_m)\) and \(\overrightarrow\alpha = (\alpha_1, \cdots, \alpha_m).\) The main results can be stated as follows. Let \(\overline{\alpha}=\alpha_1 +\cdots + \alpha_m\), \(p\) be such that \(\frac{1}{p}=\sum_{i=1}^m\frac{1}{p_i}\) and \(v_{\overrightarrow{\omega}} = \prod_{i=1}^m \omega_i^{p/p_i}\). The following statements are equivalent. (i) There is \(C>0\) such that \(||\mathcal{M}_{\overrightarrow{\alpha}}(\overrightarrow{\chi}_{\overrightarrow{E}})||_{L^{p, \infty}(v_{\overrightarrow{\omega}})} \leq C\prod_{i=1}^m ||\chi_{E_i}||_{L^{p_i}(\omega_i)}\) for all measurable set \(E_i, i=1, \cdots, m\). (ii) There is \(C>0\) such that \(||\mathcal{M}^C_{\overrightarrow{\alpha}}(\overrightarrow{\chi}_{\overrightarrow{E}})||_{L^{p, \infty}(v_{\overrightarrow{\omega}})} \leq C\prod_{i=1}^m ||\chi_{E_i}||_{L^{p_i}(\omega_i)}\) for all measurable set \(E_i, i=1, \cdots, m\). (iii) \(\overrightarrow{\omega} \in RA_{\overrightarrow{p}, \overrightarrow{\alpha}}\), that is, there is \(C>0\) such that \[ \Big (\int_Q v_{\overrightarrow{\omega}} \Big )^{\frac{1}{p}} \prod_{i=1}^m \Big (\frac{1}{|Q|^{1+\alpha_i /n}} \int_Q \chi_{E_i}(y)d(y, \partial Q)^{\alpha_i}dy \Big ) \leq C\prod_{i=1}^m \Big (\int_Q \chi_{E_i} \omega_i \Big )^{\frac{1}{p_i}} \] for all cubes \(Q\) and all measurable sets \(E_i, i=1, \cdots, m\). If \(v_{\overrightarrow{\omega}}\) is not \(0\) a.e. and statement (iii) holds then \(p_i \geq \frac{1}{1+\alpha_i} \) for all \(i\). Let \(p_i \geq \frac{1}{1+\alpha_i} \). Then the following statements are equivalent. (i) There is \(C>0\) such that \(||\mathcal{M}_{\overrightarrow{\alpha}}(\overrightarrow{f})||_{L^{p, \infty}(v_{\overrightarrow{\omega}})} \leq C\prod_{i=1}^m ||f_i||_{L^{p_i}(\omega_i)} \;(f_i \in {L^{p_i}(\omega_i)})\). (ii) There is \(C>0\) such that \(||\mathcal{M}^C_{\overrightarrow{\alpha}}(\overrightarrow{f})||_{L^{p, \infty}(v_{\overrightarrow{\omega}})} \leq C\prod_{i=1}^m ||f_i||_{L^{p_i}(\omega_i)} \;(f_i \in {L^{p_i}(\omega_i)})\). (iii) \(\overrightarrow{\omega} \in \mathcal{A}_{\overrightarrow{p}, \overrightarrow{\alpha}}\). (iv) The following conditions hold. (a) \(v_{\overrightarrow{\omega}} \in A_{mp, \frac{\overline{\alpha}}{m}}\), (b) \(\omega_i^{1-p'_i} \in A_{mp'_i, \frac{\overline \alpha - \alpha_i}{m}}\) for all \(i=1, \cdots, m\) and (c) \(\omega_i^{\frac{1}{r_i}} \in A_{\frac{mp_i}{r_i}, \frac{\alpha_i}{m}}\), for all \(i=1, \cdots, m\), where \(r_i = (m-1)p_i + 1\). If \(v_{\overrightarrow{\omega}}\) is not \(0\) a.e. and statement (iii) holds then \(p_i \geq \frac{1}{1+\alpha_i} \) for all \(i\) such that \(\alpha_i \neq 0\).

Country
Argentina
Keywords

multi(sub)linear maximal operator, Multi(Sub)Linear Maximal Operators, Maximal functions, Littlewood-Paley theory, https://purl.org/becyt/ford/1.1, https://purl.org/becyt/ford/1, Weighted Norm Inequalities, weighted norm inequality, Cesàro operator, Cesàro Operators

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
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