Numerical study on a disordered model for DNA denaturation transition

Details Numerical study on a disordered model for DNA denaturation transition Numerical study on a disordered model for DNA denaturation transition

2005-04-04

arxiv.org/abs/cond-mat/0504080v2

Phys. Rev. E 73, 011911 (2006)

Physics

Condensed Matter

Soft Condensed Matter

Latex, 25 pages including 12 postscript figures, published revised version (discussion enlarged)

Scientific paper

10.1103/PhysRevE.73.011911

We study numerically a disordered version of the model for DNA denaturation transition (DSAW-DNA) consisting of two interacting SAWs in 3d, which undergoes a first order transition in the homogeneous case. The two possible values eAT and eGC of the interactions between base pairs are taken as quenched random variables distributed with equal probability along the chain. We measure quantities averaged over disorder such as the energy density, the specific heat and the probability distribution of the loop lengths. When applying the scaling laws used in the homogeneous case we find that the transition seems to be smoother in presence of disorder, in agreement with general theoretical arguments. Nevertheless we can not rule out the possibility of a still first order transition.

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