Abstract
The effective action of sufficiently smooth center vortices in continuum Yang-Mills theory is investigated taking into account some of their basic properties observed in lattice simulations. The obtained action is given by the action of an ideal vortex configuration, which is local on the vortex worldsheet, nonlocal quantum corrections due to virtual gluon exchanges, which can be reliably calculated using perturbation theory, and the contribution of Abelian magnetic monopoles. Smooth center vortices appear to have negative rigidity. This implies that, in agreement with lattice data, in the ground state of the theory center vortices are not regular surfaces.
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