00627nas a2200097 4500008004300000245004800043210004700091520033300138100002200471856003600493 2007 en_Ud 00aConformal Metrics with Constant Q-Curvature0 aConformal Metrics with Constant QCurvature3 aWe consider the problem of varying conformally the metric of a four dimensional manifold in order to obtain constant $Q$-curvature. The problem is variational, and solutions are in general found as critical points of saddle type. We show how the problem leads naturally to consider the set of formal barycenters of the manifold.1 aMalchiodi, Andrea uhttp://hdl.handle.net/1963/2605