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{\bf Wilfried Huss and Ecaterina Sava}
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{\bf Rotor-Router Aggregation on the Comb}
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We prove a shape theorem for rotor-router aggregation on the comb, for a specific initial
rotor configuration and clockwise rotor sequence for all vertices.
Furthermore, as an application of rotor-router walks, we describe the harmonic measure
of the rotor-router aggregate and related shapes, which is useful in the study of other
growth models on the comb. We also identify the shape for which the harmonic measure is uniform.
This gives the first known example where the rotor-router cluster has non-uniform harmonic measure,
and grows with different speeds in different directions.
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