Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-06-29
J. Phys. A 25 (1992) L127
Physics
Condensed Matter
Statistical Mechanics
Old paper, for archiving. 8 pages, 1 figure, epsf, IOP macro
Scientific paper
10.1088/0305-4470/25/3/008
The critical behaviour of directed self-avoiding walks is studied on parabolic-like systems with a free boundary at x=\pm Ct^\alpha. Using a scaling argument, 1/C is shown to be a marginal variable when \alpha=\nu_\perp/\nu_\parallel=1/2, i.e., on a parabola. As a consequence the directed walk may display varying local exponents. Such a behaviour is indeed observed for restricted walks. This generalizes a result of Cardy showing that nonuniversal behaviour occurs at corners for isotropic systems.
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