On the Boundedness of q-Hausdorff Operators on q-Hardy Spaces


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Authors: O. TYR

DOI: 10.46793/KgJMat2608.1261T

Abstract:

E. Liflyand and F. Móricz proved that the Hausdorff operator generated by a function φ L1() is a linear operator bounded on the real Hardy space H1() by using the classical Fourier transform and the Hilbert transform, they also proved that this operator commutes with Hilbert transform. In this work, we extend these results to the context of q-harmonic analysis associated with the q-Rubin’s operator, we introduce the q-Hilbert transform on the real line, we study some of its main properties. Next, we define the q-Hardy spaces q1(q) by means of the q-Hilbert transforms, we finally study the q-Hausdorff operator and we prove the boundedness property and the commuting relation of this operator and q-Hilbert transform in q-Hardy spaces.



Keywords:

q-Fourier transform, q-translation operator, q-Hilbert transform, q-Hardy spaces, q-Hausdorff operator.



References:

[1]   C. Abdelkefi and M. Rachdi, Some results on the Hardy space Hk1 associated with the Dunkl operators, Ann. Univ. Ferrara Sez. VII Sci. Mat. 61 (2015), 201–218. https://doi.org/10.1007/s11565-015-0229-4

[2]   B. Amri, A. Gasmi and M. Sifi, Linear and bilinear multiplier operators for the Dunkl transform, Mediterr. J. Math. 7 (2010), 503–521. https://doi.org/10.1007/s00009-010-0057-9

[3]   J-Ph. Anker, N. Ben Salem, J. Dziubański and N. Hamda, The Hardy space H1 in the rational Dunkl setting, Constr. Approx. 42 (2015), 93–128. https://doi.org/10.1007/s00365-014-9254-2

[4]   N. Bettaibi and R. H. Bettaieb, q-analogue of the Dunkl transform on the real line, Tamsui Oxf. J. Math. Sci.  25(2) (2007), 117–205. https://doi.org/10.48550/arXiv.0801.0069

[5]   N. Bettaibi, K. Mezlini and M. El Guénichi, On Rubin’s harmonic analysis and its related positive definite functions, Acta Math. Sci. 32(5) (2012), 1851–1874. https://doi.org/10.1016/S0252-9602(12)60145-3

[6]   M. M. Chaffar, N. Bettaibi and A. Fitouhi, Sobolev type spaces associated with the q-Rubin’s operator, Matematiche 69 (2014), 37–56.

[7]   J. Chen, D. Fan and S. Wang, Hausdorff operators on Euclidean space, Appl. Math. J. Chin. Univ. 28 (2014), 548–564. https://doi.org/10.1007/s11766-013-3228-1

[8]   R. Daher and F. Saadi, The Dunkl-Hausdorff operator is bounded on the real Hardy space Hα1(), Integral Transforms Spec. Funct. 28(11) (2019), 882–892. https://doi.org/10.1080/10652469.2019.1636236

[9]   R. Daher and O. Tyr, An analog of Titchmarsh’s theorem for the q-Dunkl transform in the space Lq,α2(q), J. Pseudo-Differ. Oper. Appl. 11 (2020), 1933–1949. https://doi.org/10.1007/s11868-020-00330-6

[10]   R. Daher and O. Tyr, Growth properties of the q-Dunkl transform in the space Lq,αp(q,|x|2α+1dqx), Ramanujan J. 57 (2022), 119–134. https://doi.org/10.1007/s11139-021-00387-x

[11]   R. Daher and O. Tyr, Modulus of smoothness and theorems concerning approximation in the space Lq,α2(q) with power weight, Mediterr. J. Math. 18(69) (2021), 1–18. https://doi.org/10.1007/s00009-021-01715-7

[12]   J. Dziubański, Riesz transforms characterizations of Hardy spaces H1 for the rational Dunkl setting and multidimensional Bessel operators, J. Geom. Anal. 199 (2016), 2639–2663. https://doi.org/10.1007/s12220-015-9642-2

[13]   D. Fan and X. Lin, Hausdorff operator on real Hardy spaces, Analysis 34(4) (2014), 319–337.

[14]   A. Fitouhi and F. Bouzaffour, The q-cosine Fourier transform and the q-heat equation, Ramanujan J. 28 (2012) 443–461. https://doi.org/10.1007/s11139-012-9412-8

[15]   P. Galanopoulos and A. G. Siskakis, Hausdorff matrices and composition operators, Ill. J. Math.  45 (2001) 757–773.

[16]   G. Gasper and M. Rahman, Basic Hypergeometric Series, Encyclopedia of Mathematics and its Application Vol 35, Cambridge Univ. Press, Cambridge, 1990.

[17]   V. G. Kac and P. Cheung, Quantum Calculus, Universitext, Springer-Verlag, NewYork, 2002.

[18]   E. Liflyand, Hausdorff operators on Hardy spaces, Eurasian Math. J. 4(4) (2013), 101–141.

[19]   E. Liflyand and A. Miyachi, Boundedness of the Hausdorff operators in Hp spaces, 0 < p < 1, Studia Math. 194(3) (2009), 279–292.

[20]   E. Liflyand and F. Móricz, The Hausdorff operator is bounded on the real Hardy space H1(), Proc. Amer. Math. Soc. 128 (2000), 1391–1396.

[21]   A. Miyachi, Boundedness of the Cesáro operator in Hardy spaces, J. Fourier Anal. Appl. 128(1) (2004), 83–92. https://doi.org/10.1007/s00041-004-8005-3

[22]   R. L. Rubin, A q2-analogue operator for q2-analogue Fourier analysis, J. Math. Anal. App. 212 (1997), 571–582. https://doi.org/10.1006/jmaa.1997.5547

[23]   R. L. Rubin, Duhamel: Solutions of non-homogenous q2-analogue wave equations, Proc. Amer. Math. Soc. 135(3) (2007), 777–785.

[24]   S. Thangavelyu and Y. Xu, Riesz transforms and Riesz potentials for the Dunkl transform, J. Comp. Appl. Math. 199 (2007), 181–195. https://doi.org/10.1016/j.cam.2005.02.022

[25]   O. Tyr and R. Daher, On the q-Bessel transform of Lipschitz and Dini-Lipschitz functions on weighted space q,νp(q+), Kragujevac J. Math. 49(6) (2025), 831–846. https://doi.org/10.46793/KgJMat2506.831T

[26]   O. Tyr, F. Saadi and R. Daher, On the generalized Hilbert transform and weighted Hardy spaces in q-Dunkl harmonic analysis, Ramanujan J. 60 (2023), 95–122. https://doi.org/10.1007/s11139-022-00666-1