Volume 78, Number 6, June 2007
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||29 May 2007|
Random RNA under tension
Service de Physique Théorique, CEA Saclay - 91191 Gif-sur-Yvette, France
2 CNRS-Laboratoire de Physique Théorique de l'Ecole Normale Supérieure - 24, rue Lhomond, 75231 Paris cedex 05, France
Accepted: 7 May 2007
The Lässig-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 . For forces are irrelevant. For , the extension as a function of pulling force f scales as . The exponent γ is calculated in an ϵ-expansion: At 1-loop order , equivalent to the disorder-free case. 2-loop results yielding are briefly mentioned. Using a locking argument, we speculate that this result extends to the strong-disorder phase.
PACS: 87.15.Cc – Folding and sequence analysis / 05.70.Jk – Critical point phenomena / 64.70.Pf – Glass transitions
© Europhysics Letters Association, 2007
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