Statistical Mechanics of Semiflexible Chains: A Meanfield Variational Approach

Details Statistical Mechanics of Semiflexible Chains: A Meanfield Variational Approach Statistical Mechanics of Semiflexible Chains: A Meanfield Variational Approach

1997-05-20

arxiv.org/abs/cond-mat/9705200v1

Physics

Condensed Matter

Soft Condensed Matter

38 pages, Latex, two figures available upon request

Scientific paper

We describe a simple meanfield variational approach to study a number of properties of intrinsically stiff chains which are appropriate models for a large class of biopolymers. We present the calculation of the distribution of end-to-end distance and the elastic response of stiff chains under tension using this approach. In the former example we find that the simple expression almost quantitatively fits the results of computer simulation. For the case of the stiff chain under tension we recover analytically all the known limits. We obtain quantitative agreement with recent experiments on the stretching of DNA. The limitations of our approach are also discussed.

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