Classification of extremal functions to logarithmic Hardy-Littlewood-Sobolev inequality on the upper half space

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August 2018, 38(8): 3939-3953. doi: 10.3934/dcds.2018171

Classification of extremal functions to logarithmic Hardy-Littlewood-Sobolev inequality on the upper half space

1.	School of Mathematics and Information Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
2.	Department of Mathematics, Central Michigan University, Mount Pleasant, MI 48859, USA

* Corresponding author: Jingbo Dou

Received September 2017 Revised January 2018 Published May 2018

In this paper we mainly classify the extremal functions of logarithmic Hardy-Littlewood-Sobolev inequality on the upper half space $\mathbb{R}_+^{n}$, and also present some remarks on the extremal functions of logarithmic Hardy-Littlewood-Sobolev inequality on the whole space $\mathbb{R}^{n}$. Our main techniques are Kelvin transformation and the method of moving spheres in integral forms.

Keywords: Logarithmic Hardy-Littlewood-Sobolev inequality, extremal functions, integral system, Kelvin transformation, method of moving spheres.

Mathematics Subject Classification: Primary: 45G15; Secondary: 31B10, 34A05.

Citation: Jingbo Dou, Ye Li. Classification of extremal functions to logarithmic Hardy-Littlewood-Sobolev inequality on the upper half space. Discrete & Continuous Dynamical Systems - A, 2018, 38 (8) : 3939-3953. doi: 10.3934/dcds.2018171

References:

[1]	W. Beckner, Sharp Sobolev inequalities on the sphere and the Moser-Trudinger inequality, Ann. of Math., 138 (1993), 213-242. doi: 10.2307/2946638.
[2]	T. P. Branson, L. Fontana and C. Morpurgo, Moser-Trudinger and Beckner-Onofri's inequalities on the CR sphere, Ann. of Math., 177 (2013), 1-52. doi: 10.4007/annals.2013.177.1.1.
[3]	E. Carlen and M. Loss, Competing symmetries, the logarithmic HLS inequality and Onofri's inequality on $\mathbb{S}^n$, Geom. Funct. Anal., 2 (1992), 90-104. doi: 10.1007/BF01895706.
[4]	W. Chen and C. Li, Classification of solutions of some nonlinear elliptic equations, Duke Math. J., 63 (1991), 615-622. doi: 10.1215/S0012-7094-91-06325-8.
[5]	K. S. Chou and T. Y. H. Wan, Asymptotic radial symmetry for solutions of $Δ u + e^u= 0$ in a punctured disc, Pacific J. Math., 163 (1994), 269-276. doi: 10.2140/pjm.1994.163.269.
[6]	J. Dou and M. Zhu, Sharp Hardy-Littlewood-Sobolev inequality on the upper half space, Int. Math. Res. Not. IMRN, 2015 (2015), 651-687. doi: 10.1093/imrn/rnt213.
[7]	Y. Y. Li, Remark on some conformally invariant integral equations: The method of moving spheres, J. Eur. Math. Soc., 6 (2004), 153-180.
[8]	Y. Y. Li and L. Zhang, Liouville type theorems and Harnack type inequalities for semilinear elliptic equations, J. D'Anal. Math., 90 (2003), 27-87. doi: 10.1007/BF02786551.
[9]	Y. Y. Li and M. Zhu, Uniqueness theorems through the method of moving spheres, Duke Math. J., 80 (1995), 383-417. doi: 10.1215/S0012-7094-95-08016-8.
[10]	C. S. Lin, A classification of solutions of a conformally invariant fourth order equation in $\mathbb{R}^n$, Comment. Math. Helv., 73 (1998), 206-231. doi: 10.1007/s000140050052.
[11]	C. Morpurgo, The logarithmic Hardy-Littlewood-Sobolev inequality and extremals of zeta functions on $\mathbb{S}^n$, Geom. Funct. Anal., 6 (1996), 146-171. doi: 10.1007/BF02246771.
[12]	Q. A. Ngô and V. H. Nguyen, Sharp reversed Hardy-Littlewood-Sobolev inequality on the half space $\mathbb{R}_+^n$, Int. Math. Res. Not. IMRN, 2017 (2017), 6187-6230. doi: 10.1093/imrn/rnw108.
[13]	W. M. Ni, On the elliptic equation $Δ u + Ke^\frac{n+2}{n-2} = 0$, its generalizations and applications in geometry, Indiana Univ. Math. J., 31 (1982), 493-529. doi: 10.1512/iumj.1982.31.31040.
[14]	E. Onofri, On the positivity of the effective action in a theory of random surfaces, Comm. Math. Phys., 86 (1982), 321-326. doi: 10.1007/BF01212171.
[15]	J. Wei and X. Xu, Prescribing $Q$-curvature problem on $\mathbb{S}^n$, J. Funct. Anal., 257 (2009), 1995-2023. doi: 10.1016/j.jfa.2009.06.024.
[16]	J. Wei and X. Xu, Classification of solutions of higher order conformally invariant equations, Math. Ann., 313 (1999), 207-228. doi: 10.1007/s002080050258.
[17]	X. Xu, Uniqueness and non-existence theorems for conformally invariant equations, J. Funct. Anal., 222 (2005), 1-28. doi: 10.1016/j.jfa.2004.07.003.

show all references

References:

[1]	W. Beckner, Sharp Sobolev inequalities on the sphere and the Moser-Trudinger inequality, Ann. of Math., 138 (1993), 213-242. doi: 10.2307/2946638.
[2]	T. P. Branson, L. Fontana and C. Morpurgo, Moser-Trudinger and Beckner-Onofri's inequalities on the CR sphere, Ann. of Math., 177 (2013), 1-52. doi: 10.4007/annals.2013.177.1.1.
[3]	E. Carlen and M. Loss, Competing symmetries, the logarithmic HLS inequality and Onofri's inequality on $\mathbb{S}^n$, Geom. Funct. Anal., 2 (1992), 90-104. doi: 10.1007/BF01895706.
[4]	W. Chen and C. Li, Classification of solutions of some nonlinear elliptic equations, Duke Math. J., 63 (1991), 615-622. doi: 10.1215/S0012-7094-91-06325-8.
[5]	K. S. Chou and T. Y. H. Wan, Asymptotic radial symmetry for solutions of $Δ u + e^u= 0$ in a punctured disc, Pacific J. Math., 163 (1994), 269-276. doi: 10.2140/pjm.1994.163.269.
[6]	J. Dou and M. Zhu, Sharp Hardy-Littlewood-Sobolev inequality on the upper half space, Int. Math. Res. Not. IMRN, 2015 (2015), 651-687. doi: 10.1093/imrn/rnt213.
[7]	Y. Y. Li, Remark on some conformally invariant integral equations: The method of moving spheres, J. Eur. Math. Soc., 6 (2004), 153-180.
[8]	Y. Y. Li and L. Zhang, Liouville type theorems and Harnack type inequalities for semilinear elliptic equations, J. D'Anal. Math., 90 (2003), 27-87. doi: 10.1007/BF02786551.
[9]	Y. Y. Li and M. Zhu, Uniqueness theorems through the method of moving spheres, Duke Math. J., 80 (1995), 383-417. doi: 10.1215/S0012-7094-95-08016-8.
[10]	C. S. Lin, A classification of solutions of a conformally invariant fourth order equation in $\mathbb{R}^n$, Comment. Math. Helv., 73 (1998), 206-231. doi: 10.1007/s000140050052.
[11]	C. Morpurgo, The logarithmic Hardy-Littlewood-Sobolev inequality and extremals of zeta functions on $\mathbb{S}^n$, Geom. Funct. Anal., 6 (1996), 146-171. doi: 10.1007/BF02246771.
[12]	Q. A. Ngô and V. H. Nguyen, Sharp reversed Hardy-Littlewood-Sobolev inequality on the half space $\mathbb{R}_+^n$, Int. Math. Res. Not. IMRN, 2017 (2017), 6187-6230. doi: 10.1093/imrn/rnw108.
[13]	W. M. Ni, On the elliptic equation $Δ u + Ke^\frac{n+2}{n-2} = 0$, its generalizations and applications in geometry, Indiana Univ. Math. J., 31 (1982), 493-529. doi: 10.1512/iumj.1982.31.31040.
[14]	E. Onofri, On the positivity of the effective action in a theory of random surfaces, Comm. Math. Phys., 86 (1982), 321-326. doi: 10.1007/BF01212171.
[15]	J. Wei and X. Xu, Prescribing $Q$-curvature problem on $\mathbb{S}^n$, J. Funct. Anal., 257 (2009), 1995-2023. doi: 10.1016/j.jfa.2009.06.024.
[16]	J. Wei and X. Xu, Classification of solutions of higher order conformally invariant equations, Math. Ann., 313 (1999), 207-228. doi: 10.1007/s002080050258.
[17]	X. Xu, Uniqueness and non-existence theorems for conformally invariant equations, J. Funct. Anal., 222 (2005), 1-28. doi: 10.1016/j.jfa.2004.07.003.

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