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The curvatures of two-particle energy levels with respect to the enclosedmagnetic flux in mesoscopic disordered rings are investigated numerically. Wefind that the typical value of the curvatures is increased by interactions inthe localised regime and decreased in the metallic regime. This confirms aprediction by Akkermans and Pichard (Eur. Phys. J. B 1, 223 (1998)). Theinteraction-induced changes of the typical curvatures at different energies anddisorder strengths exhibit one-parameter scaling with a conductance-like singleparameter. This suggests that interactions could influence the conductance ofmesoscopic systems similarly.Comment: 9 pages, 7 figures. Other parts of the series: cond-mat/9706258,  cond-mat/9801134, cond-mat/980813

Two interacting particles in a disordered chain IV: Scaling of level curvatures