Ideal, best packing, and energy minimizing double helices

We study optimal double helices with straight axes (or the fattest tubes around them) computationally using three kinds of functionals; ideal ones using ropelength, best volume packing ones, and energy minimizers using two one-parameter families of interaction energies between two strands of types $r^{-α}$ and $\frac1r\exp(-kr)$. We compare the numerical results with experimental data of DNA.

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