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Behaviors of thermalization for the Fermi-Pasta-Ulam-Tsingou system with small number of particles |
| Zhenjun Zhang(张振俊)†, Jing Kang(康静), and Wen Wen(文文) |
| College of Science, Hohai University, Nanjing 210098, China |
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Abstract We study the behaviors of thermalization in Fermi-Pasta-Ulam-Tsingou (FPUT) system with small number of particles using periodic boundary conditions. The total energy has initially equidistributed among some of the lowest frequency modes. The thermalization time teq depending on system's energy density ε scales as teq ∝ ε-4 only within a certain range of nonlinearity. In this range of nonlinearity, energies can interchange between the initial excited modes and other modes continuously with time until reaching the thermalized state. With a further decreasing nonlinearity, a steeper growth than ε-4 will appear. In the very weakly nonlinear regime, energies on low frequency modes are found to be frozen on large time scales. Redistribution of mode energies happens through the resonances of high frequency modes.
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Received: 28 November 2020
Revised: 31 December 2020
Accepted manuscript online: 07 January 2021
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PACS:
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05.45.-a
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(Nonlinear dynamics and chaos)
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05.60.Cd
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(Classical transport)
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63.10.+a
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(General theory)
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| Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2017B17114 and B210202152). |
Corresponding Authors:
Zhenjun Zhang
E-mail: hi_zhangzhenjun@sina.com
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Cite this article:
Zhenjun Zhang(张振俊), Jing Kang(康静), and Wen Wen(文文) Behaviors of thermalization for the Fermi-Pasta-Ulam-Tsingou system with small number of particles 2021 Chin. Phys. B 30 060505
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