Subdiffusive fluctuations of `pulled' fronts with multiplicative noise
Rocco, A, Ebert, U and Van Saarloos, W (2000) Subdiffusive fluctuations of `pulled' fronts with multiplicative noise Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 62 (1 A). R13 - R16. ISSN 1063-651X
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Official URL: http://dx.doi.org/10.1103/PhysRevE.62.R13
We study the propagation of a “pulled” front with multiplicative noise that is created by a local perturbation of an unstable state. Unlike a front propagating into a metastable state, where a separation of time scales for sufficiently large t creates a diffusive wandering of the front position about its mean, we predict that for so-called pulled fronts, the fluctuations are subdiffusive with root mean square wandering Δ(t)∼t1/4, not t1/2. The subdiffusive behavior is confirmed by numerical simulations: For t<~600, these yield an effective exponent slightly larger than 1/4.
|Additional Information:||Copyright 2000 The American Physical Society.|
|Divisions:||Faculty of Health and Medical Sciences > Microbial and Cellular Sciences|
|Deposited By:||Symplectic Elements|
|Deposited On:||24 May 2012 13:08|
|Last Modified:||16 Feb 2013 14:33|
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