Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 46, Issue 36, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/46/36/365201
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Funding
- US National Science Foundation [NSF-DMS-0806762, NSF-CMMI-1000337]
- US AFOSR [FA9550-12-1-0332]
- ministry of education and science of Russian Federation [14.B37.21.0868]
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We consider nonlinear dynamics in a finite parity-time-symmetric chain of the discrete nonlinear Schrodinger (dNLS) type. For arbitrary values of the gain and loss parameter, we prove that the solutions of the dNLS equation do not blow up in a finite time but nevertheless, there exist trajectories starting with large initial data that grow exponentially fast for larger times with a rate that is rigorously identified. In the range of the gain and loss parameter, where the zero equilibrium state is neutrally stable, we prove that the trajectories starting with small initial data remain bounded for all times. Numerical computations illustrate these analytical results for dimers and quadrimers.
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