Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
2007-08-26
SIGMA 3 (2007), 083, 9 pages
Nonlinear Sciences
Pattern Formation and Solitons
This is a contribution to the Proc. of the Seventh Inter. Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-3
Scientific paper
10.3842/SIGMA.2007.083
On the basis of the competing cubic-quintic nonlinearity model, stability (instability) of continuous waves in nonlocal random non-Kerr nonlinear media is studied analytically and numerically. Fluctuating media parameters are modeled by the Gaussian white noise. It is shown that for different response functions of a medium nonlocality suppresses, as a rule, both the growth rate peak and bandwidth of instability caused by random parameters. At the same time, for a special form of the response functions there can be an ''anomalous'' subjection of nonlocality to the instability development which leads to further increase of the growth rate. Along with the second-order moments of the modulational amplitude, higher-order moments are taken into account.
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