Charge-and-tightness conjecture for the RpR^p ropelength energies

Let LL be a link, let Rp(L)R^p(L) be the scale-invariant energy defined in the paper, and let R(L)R(L) denote ropelength, with thickness measuring the radius of the largest embedded tube around LL. An energy is charge and tight when it diverges along sequences approaching a self-intersection or a shrinking knotted arc. Charge-and-tightness conjecture. For p2p\geq 2, the energy RpR^p is bounded below by some monotonic function of ropelength, so RpR^p approaches infinity for any sequence of links with fixed length and thickness approaching zero. This conjecture would establish the stated charge and tight properties for the energies with p2p\geq 2; the paper does not provide a resolution.

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Primary source

John M Sullivan, “Approximating Ropelength by Energy Functions”, arXiv:math/0203205 (2002).

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