Europhys. Lett., 57 (5) , pp. 752-758 (2002)
Nature of the glassy phase of RNA secondary structureF. Krzakala, M. Mézard and M. Müller
Laboratoire de Physique Théorique et Modèles Statistiques Université Paris-Sud - Bâtiment 100, F-91405 Orsay, France
(Received 29 August 2001; accepted in final form 6 December 2001)
We characterize the low-temperature phase of a simple model for RNA secondary structures by determining the typical energy scale E(l) of excitations involving l bases. At low enough temperatures, including T=0, we find a scaling law with a small exponent . Above a critical temperature, there is a different phase characterized by a relatively flat free-energy landscape resembling that of a homopolymer with a scaling exponent . These results strengthen the evidence in favour of the existence of a glass phase at low temperatures.
87.14.Gg - DNA, RNA.
87.15.-v - Biomolecules: structure and physical properties.
64.60.-i - General studies of phase transitions.
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