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# Martin boundary points of a John domain and unions of convex sets

Hiroaki Aikawa ; Kentaro Hirata ; Torbjörn Lundh (Institutionen för matematiska vetenskaper, matematik)
J. Math. Soc. Japan (0025-5645). Vol. 58 (2006), 1, p. 247-274.

We show that a John domain has finitely many minimal Martin boundary points at each Euclidean boundary point. The number of minimal Martin boundary points is estimated in terms of the John constant. In particular, if the John constant is bigger than $\sqrt3/2$ , then there are at most two minimal Martin boundary points at each Euclidean boundary point. For a class of John domains represented as the union of convex sets we give a sufficient condition for the Martin boundary and the Euclidean boundary to coincide.

Nyckelord: John domain, convex set, Martin boundary, quasihyperbolic metric, Carleson estimate, Domar's theorem, tract, weak boundary Harnack principle

CPL Pubid: 23820

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# Institutioner (Chalmers)

Institutionen för matematiska vetenskaper, matematik (2005-2016)