Abstract
In the quantum Efimov effect, identical bosons form infinitely many bound trimer states at the bound dimer dissociation threshold, with their energy spectrum obeying a universal geometrical scaling law. Inspired by the formal correspondence between the possible trajectories of a quantum particle and the possible conformations of a polymer chain, the existence of a triple-stranded DNA bound state when a double-stranded DNA is not stable was recently predicted by modelling three directed polymer chains in low-dimensional lattices, both fractal (\(d<1\)) and euclidean (\(d=1\)). A finite melting temperature for double-stranded DNA requires in \(d\le 2\) the introduction of a weighting factor penalizing the formation of denaturation bubbles, that is non-base paired portions of DNA. The details of how bubble weighting is defined for a three-chain system were shown to crucially affect the presence of Efimov-like behaviour on a fractal lattice. Here we assess the same dependence on the euclidean \(1+1\) lattice, by setting up the transfer matrix method for three infinitely long chains confined in a finite size geometry. This allows us to discriminate unambiguously between the absence of Efimov-like behaviour and its presence in a very narrow temperature range, in close correspondence with what was already found on the fractal lattice. When present, however, no evidence is found for triple-stranded bound states other than the ground state at the two-chain melting temperature.
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Notes
The mapping of bubble weighting onto the quantum formalism might be possible by introducing a tunnelling coefficient through a \(\delta \)-potential barrier at the boundary of a short-range square well. Hermiticity would, however, require both the opening and the closing of bubbles to be given the same weight.
The value of the reunion exponent c is related to the order of the melting transition of double-stranded DNA and was computed for a fully self-avoiding (i.e. non-directed) \(d=3\) polymer model [19]. The values of the reunion exponent for several directed polymers are known exactly in \(d=1\) [21] and through renormalization group estimates in generic dimension [22].
At the melting transition, the two-chain problem is equivalently described by a fully unbiased (\(y=1\), \(\sigma =1\)) random walk, thus yielding a uniform probability distribution at equilibrium in a finite size system with periodic boundary conditions
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Acknowledgments
A.T. acknowledges funding from Ministero dell’Istruzione, dell’Università e della Ricerca through grant PRIN (Progetti di RIlevanza Nazionale) 2010HXAW77_011 and from Università degli Studi di Padova through grant PRAT (PRogetti di ATeneo) CPDA121890/12.
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Mura, F., Bhattacharjee, S.M., Maji, J. et al. Efimov-Like Behaviour in Low-Dimensional Polymer Models. J Low Temp Phys 185, 102–121 (2016). https://doi.org/10.1007/s10909-016-1627-4
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DOI: https://doi.org/10.1007/s10909-016-1627-4