Abstract
The conformation of linear and star polymers is studied at the Θ temperature, determined by the vanishing of the second virial coefficient. This is achieved through exact compensation of intermolecular two-body attractions and three-body repulsions. The analogous compensation within the molecule is not complete, leaving in the star residual three-body repulsions because of a larger multiplicity. The resulting expansion is mostly concentrated in the core region. Its effect on the overall polymer size is discussed in terms of the topological ratio g= star / lin , being the mean-square radius of gyration
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