Derivation of the mKdV equation from the Euler-Poisson system at critical densities
Derivation of the mKdV equation from the Euler-Poisson system at critical densities
复制标题
临界密度下欧拉-泊松系统 mKdV 方程的推导
DOI:
10.1016/j.jde.2021.02.026
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发表时间:
2021-05
影响因子:
2.4
通讯作者:
Xi Xiaoyu
中科院分区:
文献类型:
--
作者:
Pu Xueke;Xi Xiaoyu
In this paper, we consider the long wavelength limit for the Euler-Poisson system arising in plasma including three species. It is demonstrated that when the plasma has critical densities, the modified Korteweg-de Vries (mKdV) equation can be derived, under the classical Gardner-Morikawa transform ε 1/2 (x− V t)→ x, ε 3/2 t→ t as ε→ 0, with the velocity V depending on the densities. We estimate the error between the mKdV equation and the Euler-Poisson system in Sobolev spaces. The mKdV dynamics can be seen at time interval of order O (ε− 1).
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