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We introduce a variant of the voter model in which agents may have differentdegrees of confidence on their opinions. Those with low confidence are normalvoters whose state can change upon a single contact with a differentneighboring opinion. However, confidence increases with opinion reinforcementand, above a certain threshold, these agents become zealots that do not changeopinion. We show that both strategies, normal voters and zealots, may coexist,leading to a competition between two different kinetic mechanisms:curvature-driven growth and interfacial noise. The kinetically constrainedzealots are formed well inside the clusters, away from the different opinionsat the surfaces that help keep the confidence not so high. Normal votersconcentrate in a region around the interfaces and their number, that is relatedwith the distance between the surface and the zealotry bulk, depends on therate the confidence changes. Despite this interface being rough and fragmented,typical of the voter model, the presence of zealots in the bulk of thesedomains, induces a curvature-driven dynamics, similar to the low temperaturecoarsening behavior of the non-conserved Ising model after a temperaturequench.

Curvature-driven growth and interfacial noise in the voter model with self-induced zealots