Please use this identifier to cite or link to this item:
|Title:||Numerical test of hydrodynamic uctuation theory in the Fermi-Pasta-Ulam chain.|
|Authors:||Das, Suman G.|
Mendl, Christian B.
|Publisher:||American Physical Society|
|Citation:||Physical Review E, 2014, Vol.90, p012124|
|Abstract:||Recent work has developed a nonlinear hydrodynamic fluctuation theory for a chain of coupled anharmonic oscillators governing the conserved fields, namely, stretch, momentum, and energy. The linear theory yields two propagating sound modes and one diffusing heat mode, all three with diffusive broadening. In contrast, the nonlinear theory predicts that, at long times, the sound mode correlations satisfy Kardar-Parisi-Zhang scaling, while the heat mode correlations have Lévy-walk scaling. In the present contribution we report on molecular dynamics simulations of Fermi-Pasta-Ulam chains to compute various spatiotemporal correlation functions and compare them with the predictions of the theory. We obtain very good agreement in many cases, but also some deviations.|
|Copyright:||2014 American Physical Society This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society|
|Appears in Collections:||Research Papers (TP)|
Files in This Item:
|2014_PhysRevE_90_012124.pdf||Open Access||993.69 kB||Adobe PDF||View/Open|
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.