In the moduli space of degree d polynomials, the set Per\_n(w) of classes [f]
for which f admits a cycle of exact period n and multiplier w is known to be an
algebraic hypersurface. We prove that, given a complex number w, these
hypersurfaces equidistribute towards the bifurcation current as n tends to
infinity.Comment: Modified third section. Some results of Section 3 have been made more
precise. Minor errors correcte