Directed Polymers with Constrained Winding Angle

Details Directed Polymers with Constrained Winding Angle Directed Polymers with Constrained Winding Angle

2004-12-16

arxiv.org/abs/cond-mat/0412414v3

Phys.Rev. E71 (2005) 061802

Physics

Condensed Matter

Soft Condensed Matter

34 pages, LaTeX + RevTeX 4, minor typos corrected, 2 figures added, a major revision of Section V

Scientific paper

10.1103/PhysRevE.71.061802

In this article we study from a non-perturbative point of view the entanglement of two directed polymers subjected to repulsive interactions given by a Dirac $\delta-$function potential. An exact formula of the so-called second moment of the winding angle is derived. This result is used to provide a thorough analysis of entanglement phenomena in the classical system of two polymers subjected to repulsive interactions and related problems. No approximation is made in treating the constraint on the winding angle and the repulsive forces. In particular, we investigate how repulsive forces influence the entanglement degree of the two-polymer system. In the limit of ideal polymers, in which the interactions are switched off, we show that our results are in agreement with those of previous works.

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