Orbital instability of standing waves for NLS equation on star graphs
Orbital instability of standing waves for NLS equation on star graphs
复制标题
星图上NLS方程的驻波轨道不稳定性
DOI:
--
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发表时间:
2017
影响因子:
1
通讯作者:
Adilbek Kairzhan
中科院分区:
文献类型:
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作者:
Adilbek Kairzhan
We consider a nonlinear Schrodinger (NLS) equation with any positive power nonlinearity on a star graph $Gamma$ ($N$ half-lines glued at the common vertex) with a $delta$ interaction at the vertex. The strength of the interaction is defined by a fixed value $alpha in mathbb{R}$. In the recent works of Adami {it et al.}, it was shown that for $alpha
eq 0$ the NLS equation on $Gamma$ admits the unique symmetric (with respect to permutation of edges) standing wave and that all other possible standing waves are nonsymmetric. Also, it was proved for $alpha<0$ that, in the NLS equation with a subcritical power-type nonlinearity, the unique symmetric standing wave is orbitally stable.
In this paper, we analyze stability of standing waves for both $alpha 0$. By extending the Sturm theory to Schrodinger operators on the star graph, we give the explicit count of the Morse and degeneracy indices for each standing wave. For $alpha 0$, we prove the orbital instability of all standing waves.
DOI:
10.1007/s00030-016-0417-7
发表时间:
2016
期刊:
Nonlinear Differential Equations and Applications NoDEA
影响因子:
--
作者:
S. Gilg;D. Pelinovsky;G. Schneider
通讯作者:
G. Schneider