2003/12/31 by Hsiao-Ping Hsu, Hsiao‐Ping Hsu, Peter Grassberger · 1 citation
Engineering · Physics and Astronomy · #Phase Equilibria and Thermodynamics #Scientific Research and Discoveries #Theoretical and Computational Physics #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1209/epl/i2004-10040-x
published as Europhys. Lett. 66, 874-880 (2004) · 5 pages, 5 figures
openalex publication_date 2004/06/01 · arxiv created 2004/07/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We study numerically the effective pair potential between two star polymers with equal arm lengths and equal number f of arms. The simulations were done for the soft-core Domb-Joyce model on the simple cubic lattice, to minimize corrections to scaling and to allow for an unlimited number of arms. For the sampling, we used the pruned-enriched Rosenbluth method (PERM). We find that the potential is much less soft than claimed in previous papers, in particular for f >> 1. While we verify the logarithmic divergence of V ( r ), with r being the distance between the two cores, predicted by Witten and Pincus, we find that the Mayer function for f > 20 is hardly distinguishable from that for a Gaussian potential.