Publication : t07/012

Random RNA under tension

David F. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Hagendorf C. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Wiese K.J. (Laboratoire de Physique Théorique (LPT), Ecole Normale Supérieure (ENS), UMR 8549, CNRS, 24 rue Lhomond, F-75005 Paris, FRANCE)
The Laessig-Wiese (LW) field theory for the freezing transition of random RNA secondary structures is generalized to the situation of an external force. We find a second-order phase transition at a critical applied force f = f_c. For f < f_c forces are irrelevant. For f > f_c, the extension L as a function of pulling force f scales as (f-f_c)^(1/gamma-1). The exponent gamma is calculated in an epsilon-expansion: At 1-loop order gamma = epsilon/2 = 1/2, equivalent to the disorder-free case. 2-loop results yielding gamma = 0.6 are briefly mentioned. Using a locking argument, we speculate that this result extends to the strong-disorder phase.
Année de publication : 2007
Revue : Europhys. Lett. 78 68003 (2007)
DOI : 10.1209/0295-5075/78/68003
Preprint : arXiv:q-bio.BM/0701049
Lien :
PACS : 87.15.Cc, 05.70.Jk, 64.70.Pf
Keywords : Folding and sequence analysis; Critical point phenomena; Glass transitions
Numéro Exterieur : LPTENS 07/04
Langue : Anglais

Fichier(s) à télécharger :
  • 0295-5075_78_6_68003.pdf
  • publi.pdf


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