Ulrich, S.S.UlrichMao, XiaomingXiaomingMaoGoldbart, Paul M.Paul M.GoldbartZippelius, AnnetteAnnetteZippelius2018-11-072018-11-072006https://resolver.sub.uni-goettingen.de/purl?gro-2/24246Starting from a microscopic model of randomly cross-linked particles with quenched disorder, we calculate the Landau-Wilson free energy S for arbitrary cross-link densities. Considering pure shear deformations, S takes the form of the elastic energy of an isotropic amorphous solid state, from which the shear modulus can be identified. It is found to be a universal quantity, not depending on any microscopic length-scales of the model.journal_article10.1209/epl/i2006-10310-7000242210900021