Random RNA under tension
Biomolecules
2007-06-13 v2 Disordered Systems and Neural Networks
Abstract
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.
Cite
@article{arxiv.q-bio/0701049,
title = {Random RNA under tension},
author = {Francois David and Christian Hagendorf and Kay Joerg Wiese},
journal= {arXiv preprint arXiv:q-bio/0701049},
year = {2007}
}
Comments
6 pages, 10 figures. v2: corrected typos, discussion on locking argument improved