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arXiv 1004.0101math-phmath.MP
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正则同态群与Poisson-Vlasov方程

Group of Canonical Diffeomorphisms and the Poisson-Vlasov Equations

Hasan Gümral

摘要:

Poisson-Vlasov方程描述的无碰撞等离子体动力学与粒子的哈密顿运动及其对称性有关。泊松方程是作为粒子动力学的规范对称性的约束而得到的。利用泊松方程约束下的变分导数得到简化的动力学方程。对正则同态群的Lie-Poisson约化给出动量-Vlasov方程。等离子体密度定义为动量变量辛对偶的散度。这个定义也给出了一个动量图的描述。另一种制定的动量变量作为一个规范的哈密顿系统与二次哈密顿泛函。比较了一维等离子体和二维不可压缩流体。

英文摘要:

Dynamics of collisionless plasma described by the Poisson-Vlasov equations is connected with the Hamiltonian motions of particles and their symmetries. The Poisson equation is obtained as a constraint arising from the gauge symmetries of particle dynamics. Variational derivative constrained by the Poisson equation is used to obtain reduced dynamical equations. Lie-Poisson reduction for the group of canonical diffeomorphisms gives the momentum-Vlasov equations. Plasma density is defined as the divergence of symplectic dual of momentum variables. This definition is also given a momentum map description. An alternative formulation in momentum variables as a canonical Hamiltonian system with a quadratic Hamiltonian functional is described. A comparison of one-dimensional plasma and two-dimensional incompressible fluid is presented.

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