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Factorizations and Hardy’s type identities and inequalities on upper half spaces

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Abstract

Motivated and inspired by the improved Hardy inequalities studied in their well-known works by Brezis and Vázquez (Rev Mat Univ Complut Madrid 10:443–469, 1997) and Brezis and Marcus (Ann Scuola Norm Sup Pisa Cl Sci 25(1–2):217–237, 1997), we establish in this paper several identities that imply many sharpened forms of the Hardy type inequalities on upper half spaces \(\left\{ x_{N}>0\right\} \). We set up these results for the distance to the origin, the distance to the boundary of any strip \( \mathbb {R} ^{N-1}\times \left( 0,R\right) \) and the distance to the hyperplane \(\left\{ x_{N}=0\right\} \), using both the usual full gradient and radial derivative (in the case of distance to the origin) or only the partial derivative \(\frac{\partial u}{\partial x_{N}}\) (in the case of distance to the boundary of the strip or hyperplane). One of the applications of our main results is that when \(\Omega \) is the strip \(\mathbb {R}^{N-1}\times \left( 0,2R\right) \), the bound \(\lambda \left( \Omega \right) \) given by Brezis and Marcus in Brezis and Marcus (1997) can be improved to \(\frac{z_{0}^{2}}{R^{2}}\), where \(z_{0} =2.4048 \ldots \) is the first zero of the Bessel function \(J_{0}\left( z\right) \). Our approach makes use of the notion of Bessel pairs introduced by Ghoussoub and Moradifam (Math Ann 349(1):1–57, 2011) and (Functional inequalities: new perspectives and new applications. Mathematical Surveys and Monographs, American Mathematical Society, Providence, 2013) and the method of factorizations of differential operators. In particular, our identities and inequalities offer sharpened and more precise estimates of the second remainder term in the existing Hardy type inequalities on upper half spaces in the literature, including the Hardy-Sobolev-Maz’ya type inequalities.

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Authors and Affiliations

  1. School of Science & Environment, Grenfell Campus, Memorial University of Newfoundland, Corner Brook, NL, A2H 5G4, Canada

    Nguyen Lam

  2. Department of Mathematics, University of British Columbia and The Pacific Institute for the Mathematical Sciences, Vancouver, BC, V6T1Z4, Canada

    Nguyen Lam

  3. Department of Mathematics, University of Connecticut, Storrs, CT, 06269, USA

    Guozhen Lu

  4. School of Mathematics and Information Sciences, Shaanxi Normal University, Xi’an, 710119, Shaanxi, China

    Lu Zhang

  5. Department of Mathematical Sciences, Binghamton University, Binghamton, NY, 13902, USA

    Lu Zhang

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  1. Nguyen Lam
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  2. Guozhen Lu
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Correspondence to Guozhen Lu or Lu Zhang.

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Communicated by H.Brezis.

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N. L. was partially supported by a fellowship from the Pacific Institute for the Mathematical Sciences. G. L. was partially supported by a Grant from the Simons Foundation.

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Lam, N., Lu, G. & Zhang, L. Factorizations and Hardy’s type identities and inequalities on upper half spaces. Calc. Var. 58, 183 (2019). https://doi.org/10.1007/s00526-019-1633-x

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