Issue |
EPL
Volume 78, Number 6, June 2007
|
|
---|---|---|
Article Number | 68003 | |
Number of page(s) | 6 | |
Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
DOI | https://doi.org/10.1209/0295-5075/78/68003 | |
Published online | 29 May 2007 |
Random RNA under tension
1
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
Corresponding authors: Francois.David@cea.fr hagendor@lpt.ens.fr wiese@lpt.ens.fr
Received:
13
February
2007
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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