Abstract
Deforming a two-dimensional conformal field theory (CFT) on one side of a trivial defect line gives rise to a defect separating the original theory from its deformation. The Casimir force between these defects and other defect lines or boundaries is used to construct flows on bulk moduli spaces of CFTs. It turns out, that these flows are constant reparametrizations of gradient flows of the logarithm of the g-functions of the chosen defect or boundary condition. The special flows associated with supersymmetric boundary conditions in N = (2, 2) superconformal field theories agree with the attractor flows studied in the context of black holes in N = 2 supergravity.
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