A theory of inner Riesz balayage and its applications

Tom 68 / 2020

Natalia Zorii Bulletin Polish Acad. Sci. Math. 68 (2020), 41-67 MSC: Primary 31C15. DOI: 10.4064/ba191104-31-1 Opublikowany online: 2 March 2020

Streszczenie

We establish a theory of balayage for the Riesz kernel $|x-y|^{\alpha -n}$, $\alpha \in (0,2]$, on $\mathbb R^n$, $n\ge 3$, alternative to that suggested in the book by Landkof. A need for that is caused by the fact that the balayage in that book is defined by means of the integral representation, which, however, so far is not completely justified. Our alternative approach is mainly based on Cartan’s ideas concerning inner balayage, formulated by him for the Newtonian kernel. Applying the theory of inner Riesz balayage thereby developed, we obtain a number of criteria for the existence of an inner equilibrium measure $\gamma _A$ for $A\subset \mathbb R^n$ arbitrary, in particular given in terms of the total mass of the inner swept measure $\mu ^A$ with $\mu $ suitably chosen. For example, $\gamma _A$ exists if and only if $\varepsilon ^{A^*}\ne \varepsilon $, where $\varepsilon $ is the Dirac measure at $x=0$ and $A^*$ the inverse of $A$ relative to the sphere $|x|=1$, which leads to a Wiener type criterion of inner $\alpha $-irregularity. The results obtained are illustrated by examples.

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