| Issue |
Europhys. Lett.
Volume 73, Number 2, January 2006
|
|
|---|---|---|
| Page(s) | 178 - 182 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2005-10382-9 | |
| Published online | 09 December 2005 | |
Optimal paths as correlated random walks
Department of Physics, Bar-Ilan University - Ramat-Gan 52900, Israel
Received:
31
July
2005
Accepted:
22
November
2005
A numerical study of optimal paths in the directed polymer model shows that the paths
are similar to correlated random walks. It is shown that when a directed optimal path of length
t is divided into 3 segments whose length is 
, the correlation between the transversal
movements along the first and last path segments is independent of the path length t.
It is also shown that the transversal correlations along optimal paths decrease as the paths
approach their endpoints. The numerical results obtained for optimal paths in 1+4 dimensions are
qualitatively similar to those obtained for optimal paths in lower dimensions,
and the data supplies a strong numerical indication that 1+4 is not the upper critical
dimension of this model, and of the associated KPZ equation.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 05.50.+q – Lattice theory and statistics (Ising, Potts, etc.)
© EDP Sciences, 2006
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