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Using numerical simulations we investigate the space-time properties of asystem in which spirals emerge within coarsening domains, thus giving rise tonon-trivial internal dynamics. Initially proposed in the context of populationdynamics, the studied six-species model exhibits growing domains composed ofthree species in a rock-paper-scissors relationship. Through the investigationof different quantities, such as space-time correlations and the derivedcharacteristic length, autocorrelation, density of empty sites, and interfacewidth, we demonstrate that the non-trivial dynamics inside the domains affectsthe coarsening process as well as the properties of the interfaces separatingdifferent domains. Domain growth, aging, and interface fluctuations are shownto be governed by exponents whose values differ from those expected in systemswith curvature driven coarsening.

Coarsening with non-trivial in-domain dynamics: correlations and interface fluctuations