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The topological susceptibility of the SU(3) random vortex world-surfaceensemble, an effective model of infrared Yang-Mills dynamics, is investigated.The model is implemented by composing vortex world-surfaces of elementarysquares on a hypercubic lattice, supplemented by an appropriate specificationof vortex color structure on the world-surfaces. Topological charge isgenerated in this picture by writhe and self-intersection of the vortexworld-surfaces. Systematic uncertainties in the evaluation of the topologicalcharge, engendered by the hypercubic construction, are discussed. Results forthe topological susceptibility are reported as a function of temperature andcompared to corresponding measurements in SU(3) lattice Yang-Mills theory. Inthe confined phase, the topological susceptibility of the random vortexworld-surface ensemble appears quantitatively consistent with Yang-Millstheory. As the temperature is raised into the deconfined regime, thetopological susceptibility falls off rapidly, but significantly less so than inSU(3) lattice Yang-Mills theory. Possible causes of this deviation, rangingfrom artefacts of the hypercubic description to more physical sources, such asthe adopted vortex dynamics, are discussed.

Center vortex model for the infrared sector of SU(3) Yang-Mills theory: Topological susceptibility