Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-04-12
Physics
Condensed Matter
Statistical Mechanics
18 pages, 7 eps figures; parts of the manuscript are rewritten so as to improve clarity of presentation; an extra reference ad
Scientific paper
We show that the Density of States (DoS) for lattice Self Avoiding Walks can be estimated by using an inverse algorithm, called flatIGW, whose step-growth rules are dynamically adjusted by requiring the energy histogram to be locally flat. Here, the (attractive) energy associated with a configuration is taken to be proportional to the number of non-bonded nearest neighbor pairs (contacts). The energy histogram is able to explicitly direct the growth of a walk because the step-growth rule of the Interacting Growth Walk \cite{IGW} samples the available nearest neighbor sites according to the number of contacts they would make. We have obtained the complex Fisher zeros corresponding to the DoS, estimated for square lattice walks of various lengths, and located the $\theta$ temperature by extrapolating the finite size values of the real zeros to their asymptotic value, $\sim 1.49$ (reasonably close to the known value, $\sim 1.50$ \cite{barkema}).
Murthy K. P. N.
Narasimhan S. L.
Ponmurugan M.
Sridhar V.
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