arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.16778nlin.PS
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深水表面重力波中孤立子气体的非线性谱合成

Nonlinear spectral synthesis of soliton gas in deep-water surface gravity waves

Pierre Suret, Alexey Tikan, Félicien Bonnefoy, François Copie, Guillaume Ducrozet, Andrey Gelash, Gaurav Prabhudesai, Guillaume Michel, Annette Cazaubiel, Eric … 展开作者

Pierre Suret, Alexey Tikan, Félicien Bonnefoy, François Copie, Guillaume Ducrozet, Andrey Gelash, Gaurav Prabhudesai, Guillaume Michel, Annette Cazaubiel, Eric Falcon, Gennady El, Stéphane Randoux

摘要:

孤立子气体代表了物理系统中的大随机孤立子系综,这些物理系统显示出领先阶的可积动力学。尽管在流体和光学介质中普遍存在孤子气体的重要理论发展和观测证据,但它们的受控实验实现一直缺失。利用一维聚焦非线性薛定谔方程的非线性谱理论(逆散射变换),首次在深水表面重力波中实现了致密孤子气体的可控合成.在一维水槽中实验产生了孤子气体,并证明了我们可以控制和测量孤子气体的态密度。e. IST谱相空间中孤子气体参数化的概率密度函数。所产生的流体动力学孤子气体的非线性谱分析表明,在扰动高阶效应的影响下,打破了波动动力学的可积性的状态密度缓慢变化。

英文摘要:

Soliton gases represent large random soliton ensembles in physical systems that display integrable dynamics at the leading order. Despite significant theoretical developments and observational evidence of ubiquity of soliton gases in fluids and optical media their controlled experimental realization has been missing. We report the first controlled synthesis of a dense soliton gas in deep-water surface gravity waves using the tools of nonlinear spectral theory (inverse scattering transform (IST)) for the one-dional focusing nonlinear Schrödinger equation. The soliton gas is experimentally generated in a one-dimensional water tank where we demonstrate that we can control and measure the density of states, i. e. the probability density function parametrizing the soliton gas in the IST spectral phase space. Nonlinear spectral analysis of the generated hydrodynamic soliton gas reveals that the density of states slowly changes under the influence of perturbative higher-order effects that break the integrability of the wave dynamics.

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