Volume 57, Number 5, March 2002
|Page(s)||752 - 758|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Nature of the glassy phase of RNA secondary structure
Laboratoire de Physique Théorique et Modèles Statistiques
Université Paris-Sud - Bâtiment 100, F-91405 Orsay,
Accepted: 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 θ. 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.
PACS: 87.14.Gg – DNA, RNA / 87.15.-v – Biomolecules: structure and physical properties / 64.60.-i – General studies of phase transitions
© EDP Sciences, 2002
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