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The rapid collapse of a polymer, due to external forces or changes insolvent, yields a long-lived `crumpled globule.' The conjectured fractalstructure shaped by hierarchical collapse dynamics has proved difficult toestablish, even with large simulations. To unravel this puzzle, we study acoarse-grained model of in-falling spherical blobs that coalesce upon contact.Distances between pairs of monomers are assigned upon their initialcoalescence, and do not `equilibrate' subsequently. Surprisingly, the modelreproduces quantitatively the dependence of distance on segment length,suggesting that the slow approach to scaling is related to the widedistribution of blob sizes.

Coalescence Model for Crumpled Globules Formed in Polymer Collapse