Geodesic
Harmonic measure of arcs of fixed length
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 48, Tome 491 (2020), pp. 145-152
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Jordan domains $\Omega$ with piece-wise smooth boundaries are treated such that all arcs $\alpha\subset \partial \Omega$ having fixed length $l$, $0, have equal harmonic measures $\omega(z_0,\alpha,\Omega)$ evaluated at some point $z_0\in \Omega$. It is proved that $\Omega$ is a disk centered at $z_0$ if the ratio $l/\text{length}(\partial \Omega)$ is irrational and that $\Omega$ possesses rotational symmetry by some angle $2\pi/n$, $n\ge 2$, around the point $z_0$, if this ratio is rational. 
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S. Samarasiri; A. Yu. Solynin. Harmonic measure of arcs of fixed length. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 48, Tome 491 (2020), pp. 145-152. http://geodesic.mathdoc.fr/item/ZNSL_2020_491_a7/

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