Random RNA under tension

Details Random RNA under tension Random RNA under tension

2007-01-29

arxiv.org/abs/q-bio/0701049v2

Europhys. Lett., 78 (2007) 68003

Biology

Quantitative Biology

Biomolecules

6 pages, 10 figures. v2: corrected typos, discussion on locking argument improved

Scientific paper

10.1209/0295-5075/78/68003

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.

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