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Estimates for p-adic fractional integral operator and its commutators on p-adic Morrey–Herz spaces
Journal of Inequalities and Applications volume 2022, Article number: 92 (2022)
Abstract
This research investigates the boundedness of a p-adic fractional integral operator on p-adic Morrey–Herz spaces. In particular, p-adic central bounded mean oscillations \((C\dot{M}O)\) and Lipschitz estimate for commutators of the p-adic fractional integral operator are provided as well.
1 Introduction
According to the well-known Ostrowski theorem [1], any nontrivial valuation on the field of rational numbers \(\mathbb{Q}\) is equivalent either to the p-adic valuation \(|\cdot |_{p}\) or to one of real valuations \(|\cdot |\), where p is a prime number. The former norm is defined as follows: if any rational number \(x\neq 0\) is denoted as \(x = p^{\gamma}s/t\), where \(\gamma =\gamma (x)\in \mathbb{Z}\) and the integers s, t are not divisible by p, then \(|x|_{p}=p^{\gamma}\), \(|0|_{p} = 0\). The norm \(|\cdot |_{p}\) satisfies the strong triangle inequality \(|x + y|_{p}\leq \max (|x|_{p}, |y|_{p})\). The extended form of any \(x\neq 0\in \mathbb{Q}_{p}\) (field of p-adic numbers) is given in [2] as
where \(\alpha _{i},\gamma \in \mathbb{Z}\), \(\alpha _{i}\in \frac{\mathbb{Z}}{p\mathbb{Z}_{p}}\), \(\alpha _{0}\neq 0\).
In what follows the n-dimensional vector space \(\mathbb{Q}_{p}^{n}\) over \(\mathbb{Q}_{p}\) is equipped with the following absolute value:
Let \(B_{\gamma}(\mathbf{a})\) and \(S_{\gamma}(\mathbf{a})\) represent respectively the ball and sphere of \(\mathbb{Q}_{p}^{n}\) centered at \(\mathbf{a}\in \mathbb{Q}_{p}^{n}\) and radius \(p^{\gamma}>0\):
Since \(\mathbb{Q}_{p}^{n}\) is a locally compact commutative group with respect to addition, in \(\mathbb{Q}_{p}^{n}\) there exists a positive Haar measure dx invariant under shift \(d(\mathbf{x}+\mathbf{a})=d(\mathbf{x})\cdot \) It is worth noting that dx is normalized by the equality \(\int _{{B_{0}(\mathbf{0})}}d\mathbf{x}=1\). It is easy to find \(\int _{B_{\gamma}(\mathbf{a})}d\mathbf{x}=p^{n\gamma}\) and \(\int _{S_{\gamma}(\mathbf{a})}d\mathbf{x}=p^{n\gamma}(1-p^{-n})\) for any \(\mathbf{a}\in \mathbb{Q}_{p}^{n}\).
The field of p-adic numbers can be applied in many scientific fields. In physics, the groundbreaking application is the p-adic AdS/CFT [3]. Khrennikov et al. [4] enhanced p-adic wavelet for modeling reaction-diffusion dynamics. Its application in biology includes the models for hierarchical structures of genetic code [5] and protein [6]. Furthermore, p-adic numbers have found a novel application in harmonic analysis and mathematical physics (see, for example, [2, 7–11] and related references).
The topic of fractional calculus is undergoing fast development with more and more appealing applications in the real world (see, for instance, [12–16]). One of the principal options behind the popularity of the area is that fractional-order differentiations and integrations are more beneficial tools in expressing real-world matters than the integer-order ones. Moreover, it is applied in the solution of linear constant coefficient fractional differential equations of any commensurate order and the CRONE control-system design toolbox for the control engineering community (see [17, 18] and related references therein). Recently many researchers have made tremendous contributions to the topic of fractional calculus by developing multiple fractional expressions in diverse publications (see, for instance, [19–25]). Also, its applications have been found in various fields of science and engineering, such as rheology, fluid flow, probability, and electrical networks. In this context, fractional integral operators are an important part of the mathematical analysis as they construct and formulate inequalities which have multiple applications in scientific areas that can be seen in the existing literature [26–28]. The boundedness of fractional integral operator on several function spaces is a key area not only in harmonic analysis but also in differentiation theory, partial differential equation, and potential theory [29–31]. In this link, Taibleson [32] defined the p-adic fractional integral operator as
In the past, the above operator has received a considerable attention. The explicit formula of p-adic fractional integral \(\mathbb{Q}_{p}\) along with the development of analytical potential theory on \(\mathbb{Q}_{p}^{n}\) is acquired in [33] and [34] respectively. The fundamental properties of p-adic fractional integral operator on \(\mathbb{Q}_{p}^{n}\) can be seen in [32]. Moreover, the boundedness of commutators of p-adic fractional integral operator respectively on central Morrey spaces and generalized Morrey spaces in the p-adic field is obtained in [11] and [35]. Recently, the boundedness of \(I^{p}_{\beta} \) on Herz spaces has been reported in [36].
Furthermore, suppose that \(b \colon \mathbb{Q}_{p}^{n} \to \mathbb{R}\) and \(f \colon \mathbb{Q}_{p}^{n} \to \mathbb{R}\) are measurable mappings, then the commutators of fractional integral operator can be defined as follows:
Motivated by the above results, we obtain the boundedness of p-adic fractional integral operator on Morrey–Herz spaces. Furthermore, \(C\dot{M}O\) and Lipschitz estimates for commutators of p-adic fractional integral operator on Morrey–Herz spaces are also studied. Before turning to our main results, let us specify that \(\chi _{k}\) is the characteristic function of the sphere and a letter C denotes a constant with values that may differ at its occurrence. Also, we use the following generalized Hölder inequality in the article. Let \(q>1\) be a real number such that \(1/q+1/q'=1\), and let \(f\in L^{q}(\mathbb{Q}_{p}^{n})\) and \(g\in L^{q'}(\mathbb{Q}_{p}^{n})\), then fg is integrable on \(\mathbb{Q}_{p}^{n}\) and
Definition 1.1
([37])
Let \(1< p<\infty \). The p-adic space \((C\dot{M}O)\) is defined as follows:
where \(f_{B_{\gamma}}=\frac{1}{|B_{\gamma}|_{H}} \int _{B_{\gamma}} f( \mathbf{t}) \,d\mathbf{t}\), \(|B_{\gamma}|_{H}\) denotes the Haar measure of \(B_{\gamma}\).
Definition 1.2
([38])
Let \(\alpha \in \mathbb{R}\), \(\lambda \geq 0\), \(0< p<\infty \), and \(0< q<\infty \). The homogeneous p-adic Morrey–Herz space is defined by
where
The above space is reduced to Herz space in p-adic field if \(M\dot{K}^{\alpha ,0}_{q,p}(\mathbb{Q}_{p}^{n})=\dot{K}^{\alpha ,q}_{p}( \mathbb{Q}_{p}^{n})\), see [39] for details.
Definition 1.3
([38])
Let \(\gamma \in \mathbb{R}^{+}\). The Lipschitz space \(\Lambda _{\gamma}(\mathbb{Q}_{p}^{n})\) is the space of all measurable function f on \(\mathbb{Q}_{p}^{n}\) such that
Now, we move towards the first key result of the article.
2 Estimates for \(I^{p}_{\beta}\)
In the following section we obtain the boundedness of p-adic fractional integral operator on Morrey–Herz spaces.
Theorem 2.1
Let \(0<\beta <n\), \(1< p_{1},p_{2}<\infty \), \(p_{1}'< p_{2}<\infty \), \(0< q_{1},q_{2}<\infty \), and \(\frac{1}{p_{1}}-\frac{1}{p_{2}}=\frac{\beta}{n}\). Suppose that \(-n/p_{2}<\alpha <n/p_{1}'\) and \(0<\lambda <\alpha \), then
for all \(f\in M\dot{K}^{\alpha ,\lambda}_{q_{1},p_{1}}(\mathbb{Q}_{p}^{n})\).
Proof of Theorem 2.1
Since \(f\in M\dot{K}^{\alpha ,\lambda}_{q_{1},p_{1}}(\mathbb{Q}_{p}^{n})\) and \(i\in \mathbb{Z}\), we can write
We proceed as
Now, we estimate I, noticing that for each \(\mathbf{x}\in S_{k}\) and \(\mathbf{t}\in S_{i}\) with \(i\leq k\). Now, since \(\frac{\beta}{n}=\frac{1}{p_{1}}-\frac{1}{p_{2}}\) and applying Hölder’s inequality, we have
By means of Jensen’s inequality and (5), we have
From now on, we divide our proof in two cases. When \(1< q_{1}<\infty \) and \(\alpha < n/p_{1}'\). Applying Hölder’s inequality, we get
When \(0< q_{1}\leq 1\), we tackle the case as follows:
Now we evaluate II for each \(\mathbf{x}\in S_{k}\) and \(\mathbf{t}\in S_{i}\) with \(k+1\leq i\). By means of Hölder’s inequality, we arrive at
Now, by Jensen’s inequality and (6), we have
In the rest of the proof we consider a couple of cases. When \(1< q_{1}<\infty \), since \(\alpha >-n/p_{2}\) and by the application of Hölder’s inequality, we have
Because of \(\alpha >-n/p_{2}\), the estimation of \(\mathit{II}_{1}\) is given by
Next, since \(\lambda <\alpha /2\), we have
If \(0< q_{1}\leq 1\), we have
Since \(\alpha >-n/p_{2}\), the estimate of \(\mathit{II}_{1}'\) is done as follows:
Now \(\alpha >0\) and \(\lambda <\alpha \), the estimation of \(\mathit{II}_{2}'\) is carried out as follows:
By combining the estimates of I and II, the proof of Theorem 2.1 is completed. □
3 \(C\dot{M}O\) and Lipschitz estimates for \(I^{p,b}_{\beta}\)
In the present section we establish the \(C\dot{M}O(\mathbb{Q}_{p}^{n})\) and Lipschitz estimates for commutators of p-adic fractional integral operator on Morrey–Herz spaces. However, before doing that, we need an important result which is as follows.
Lemma 3.1
([40])
Let \(b\in C\dot{M}O^{1}(\mathbb{Q}_{p}^{n})\) and let k, \(i\in \mathbb{Z}\). Then
Theorem 3.2
Let \(<\beta <n\), \(b\in C\dot{M}O^{\max \{p_{1}',p_{2}\}}(\mathbb{Q}_{p}^{n})\), \(1< p_{1},p_{2}<\infty \), \(p_{1}'< p_{2}<\infty \), \(0< q_{1},q_{2}<\infty \), and \(\frac{1}{p_{1}}-\frac{1}{p_{2}}=\frac{\beta}{n}\). Suppose \(-n/p_{2}<\alpha <n/p_{1}'\) and \(0<\lambda <\alpha \), then
for all \(f\in M\dot{K}^{\alpha ,\lambda}_{q_{1},p_{1}}(\mathbb{Q}_{p}^{n})\).
Theorem 3.3
Let \(0<\beta <n\), \(b\in \Lambda _{\gamma}(\mathbb{Q}_{p}^{n})\) \((0<\gamma <1)\), \(1< p_{1}\), \(p_{2}<\infty \), \(p_{1}'< p_{2}<\infty \), \(0< q_{1}\), \(q_{2}<\infty \), and \(\frac{1}{p_{1}}-\frac{1}{p_{2}}=\frac{\beta +\gamma}{n}\). Suppose \(-n/p_{2}<\alpha <n/p_{1}'\) and \(0<\lambda <\alpha \), then
for all \(f\in M\dot{K}^{\alpha ,\lambda}_{q_{1},p_{1}}(\mathbb{Q}_{p}^{n})\).
Proof of Theorem 3.2
For \(i\in \mathbb{Z}\), we can write
Thus, we begin
The estimate of L is carried out as follows. For each \(\mathbf{x}\in S_{k}\) and \(\mathbf{t}\in S_{i}\) with \(i\leq k\), we have
By noticing that \(\frac{1}{p_{1}}-\frac{1}{p_{2}}=\frac{\beta}{n}\) and applying Hölder’s inequality, we get
Next we move towards the estimation of \(L_{2}\), for this we use Lemma 3.1.
We make use of Hölder’s inequality along with \(\frac{1}{p_{1}}-\frac{1}{p_{2}}=\frac{\beta}{n}\) to evaluate \(L_{21}\).
In a similar way we can estimate \(L_{22}\). Since \(\frac{1}{p_{1}}-\frac{1}{p_{2}}=\frac{\beta}{n}\), using Hölder’s inequality, we obtain
Combining the above values and by means of Jensen’s inequality, we have
From here on, we consider a couple of cases. When \(1< q_{1}<\infty \), applying Hölder’s inequality from the outset, we have
We consider the other case, when \(0< q_{1}\leq 1\), since \(\alpha < n/p_{1}'\), we handle the case as
Next we turn our attention towards estimating LL. For each \(\mathbf{x}\in S_{k}\) and \(\mathbf{t}\in S_{i}\) with \(k+1\leq i\), we proceed as follows:
We apply Hölder’s inequality for evaluating \(\mathit{LL}_{1}\). Since \(\frac{1}{p_{1}}-\frac{1}{p_{2}}=\frac{\beta}{n}\), we obtain
The estimation of \(\mathit{LL}_{2}\) is done by using Lemma 3.1.
Implying Hölder’s inequality to evaluate \(\mathit{LL}_{21} \), we have
Now, we estimate \(\mathit{LL}_{22}\), for this Hölder’s inequality is helpful, therefore we arrive at
Combining the above values and by means of Jensen’s inequality, we have
From this point on, we consider two cases. When \(1< q_{1}<\infty \) and by Hölder’s inequality, we get
Since \(\alpha >-n/p_{2}\), the evaluation of \(\mathit{LL}'_{1}\) is obtained by
Next, by noticing that \(\lambda <\alpha /2\), we have
For the second case \(0< q_{1}\leq 1\), we are down to
Because \(\alpha >-n/p_{2}\), we estimate \(\mathit{LL}_{1}''\) as
Since \(\alpha >0\) and \(\lambda <\alpha \), the estimation of \(\mathit{LL}_{2}''\) is given by
Combining the estimates of L and LL, we are done with the proof of Theorem 3.2. □
Proof of Theorem 3.3
When \(b\in \Lambda _{\gamma}(\mathbb{Q}_{p}^{n})\), the inequality
can be easily obtained under the assumptions of Theorem 3.3, and the proof of Theorem 3.3 is a consequence of Theorem 2.1. □
5 Conclusion
Herein, the boundedness of a p-adic fractional integral operator on p-adic Morrey–Herz spaces is studied. In addition, the property of boundedness for commutators of the p-adic fractional integral operator on Morrey–Herz spaces in the p-adic field is also obtained when the symbol function is from \(C\dot{M}O\) and Lipschitz spaces.
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Acknowledgements
The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University, Abha 61413, Saudi Arabia for funding this work through research groups program under grant number R.G. P-1/129/43.
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Formal analysis, NS, MZ; investigation, NS, FJ; resources, MA, FJ; funding acquisition, MA, FJ; supervision, MA, FJ. All authors read and approved the final manuscript.
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Sarfraz, N., Aslam, M., Zaman, M. et al. Estimates for p-adic fractional integral operator and its commutators on p-adic Morrey–Herz spaces. J Inequal Appl 2022, 92 (2022). https://doi.org/10.1186/s13660-022-02829-6
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DOI: https://doi.org/10.1186/s13660-022-02829-6