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March  2016, 15(2): 657-699. doi: 10.3934/cpaa.2016.15.657

Some observations on the Green function for the ball in the fractional Laplace framework

Claudia Bucur 1,

1. 

Dipartimento di Matematica "Federigo Enriques", Università degli Studi di Milano, Via Cesare Saldini, 50, I-20133, Milano, Italy

Received  March 2015 Revised  November 2015 Published  January 2016

We consider a fractional Laplace equation and we give a self-contained elementary exposition of the representation formula for the Green function on the ball. In this exposition, only elementary calculus techniques will be used, in particular, no probabilistic methods or computer assisted algebraic manipulations are needed. The main result in itself is not new (see for instance [2, 9]), however we believe that the exposition is original and easy to follow, hence we hope that this paper will be accessible to a wide audience of young researchers and graduate students that want to approach the subject, and even to professors that would like to present a complete proof in a PhD or Master Degree course.
Keywords: Poisson kernel, fundamental solution, Fractional Laplacian, Green function, mean value property..
Mathematics Subject Classification: Primary: 35C15, 35S05; Secondary: 35S30, 31B1.
Citation: Claudia Bucur. Some observations on the Green function for the ball in the fractional Laplace framework. Communications on Pure & Applied Analysis, 2016, 15 (2) : 657-699. doi: 10.3934/cpaa.2016.15.657
References:
[1]

Milton Abramowitz and Irene Anne Stegun eds., Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables,, A Wiley-Interscience Publication. John Wiley & Sons, (1984).   Google Scholar

[2]

R. M. Blumenthal, R. K. Getoor and D. B. Ray, On the distribution of first hits for the symmetric stable processes,, \emph{Trans. Amer. Math. Soc.}, 99 (1961), 540.   Google Scholar

[3]

Claudia Bucur and Enrico Valdinoci, Nonlocal diffusion and applications,, accepted for Publication for the Springer Series \emph{Lecture Notes of the Unione Matematica Italiana}, (2015).   Google Scholar

[4]

Eleonora Di Nezza, Giampiero Palatucci and Enrico Valdinoci, Hitchhiker's guide to the fractional Sobolev spaces,, \emph{Bull. Sci. Math.}, 136 (2012), 521.  doi: 10.1016/j.bulsci.2011.12.004.  Google Scholar

[5]

Bartłomiej Dyda, Fractional Hardy inequality with a remainder term,, \emph{Colloq. Math.}, 122 (2011), 59.  doi: 10.4064/cm122-1-6.  Google Scholar

[6]

Bartłomiej Dyda, Fractional calculus for power functions and eigenvalues of the fractional Laplacian,, \emph{Fract. Calc. Appl. Anal.}, 15 (2012), 536.  doi: 10.2478/s13540-012-0038-8.  Google Scholar

[7]

Lawrence C. Evans, Partial Differential Equations,, volume 19 of Graduate Studies in Mathematics, (2010).  doi: 10.1090/gsm/019.  Google Scholar

[8]

Yitzhak Katznelson, An Introduction to Harmonic Analysis,, Cambridge Mathematical Library. Cambridge University Press, (2004).  doi: 10.1017/CBO9781139165372.  Google Scholar

[9]

Tadeusz Kulczycki, Properties of Green function of symmetric stable processes,, \emph{Probab. Math. Statist.}, 17 (1997), 339.   Google Scholar

[10]

N. S. Landkof, Foundations of Modern Potential Theory,, Springer-Verlag, (1972).   Google Scholar

[11]

Michael Reed and Barry Simon, Methods of Modern Mathematical Physics. I. Functional Analysis,, Academic Press, (1972).   Google Scholar

[12]

Luis Silvestre, Regularity of the obstacle problem for a fractional power of the Laplace operator,, \emph{Comm. Pure Appl. Math.}, 60 (2007), 67.  doi: 10.1002/cpa.20153.  Google Scholar

[13]

Richard L. Wheeden and Antoni Zygmund, Measure and Integral,, An introduction to real analysis, (1977).   Google Scholar

show all references

References:
[1]

Milton Abramowitz and Irene Anne Stegun eds., Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables,, A Wiley-Interscience Publication. John Wiley & Sons, (1984).   Google Scholar

[2]

R. M. Blumenthal, R. K. Getoor and D. B. Ray, On the distribution of first hits for the symmetric stable processes,, \emph{Trans. Amer. Math. Soc.}, 99 (1961), 540.   Google Scholar

[3]

Claudia Bucur and Enrico Valdinoci, Nonlocal diffusion and applications,, accepted for Publication for the Springer Series \emph{Lecture Notes of the Unione Matematica Italiana}, (2015).   Google Scholar

[4]

Eleonora Di Nezza, Giampiero Palatucci and Enrico Valdinoci, Hitchhiker's guide to the fractional Sobolev spaces,, \emph{Bull. Sci. Math.}, 136 (2012), 521.  doi: 10.1016/j.bulsci.2011.12.004.  Google Scholar

[5]

Bartłomiej Dyda, Fractional Hardy inequality with a remainder term,, \emph{Colloq. Math.}, 122 (2011), 59.  doi: 10.4064/cm122-1-6.  Google Scholar

[6]

Bartłomiej Dyda, Fractional calculus for power functions and eigenvalues of the fractional Laplacian,, \emph{Fract. Calc. Appl. Anal.}, 15 (2012), 536.  doi: 10.2478/s13540-012-0038-8.  Google Scholar

[7]

Lawrence C. Evans, Partial Differential Equations,, volume 19 of Graduate Studies in Mathematics, (2010).  doi: 10.1090/gsm/019.  Google Scholar

[8]

Yitzhak Katznelson, An Introduction to Harmonic Analysis,, Cambridge Mathematical Library. Cambridge University Press, (2004).  doi: 10.1017/CBO9781139165372.  Google Scholar

[9]

Tadeusz Kulczycki, Properties of Green function of symmetric stable processes,, \emph{Probab. Math. Statist.}, 17 (1997), 339.   Google Scholar

[10]

N. S. Landkof, Foundations of Modern Potential Theory,, Springer-Verlag, (1972).   Google Scholar

[11]

Michael Reed and Barry Simon, Methods of Modern Mathematical Physics. I. Functional Analysis,, Academic Press, (1972).   Google Scholar

[12]

Luis Silvestre, Regularity of the obstacle problem for a fractional power of the Laplace operator,, \emph{Comm. Pure Appl. Math.}, 60 (2007), 67.  doi: 10.1002/cpa.20153.  Google Scholar

[13]

Richard L. Wheeden and Antoni Zygmund, Measure and Integral,, An introduction to real analysis, (1977).   Google Scholar

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