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新疆大学物理系,
Published:1982
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[1]李子平.高阶微商约束系统的对称变换[J].新疆大学学报(自然科学版),1982(01):49-63.
李子平. 高阶微商约束系统的对称变换[J]. Journal of Xinjiang University (Natural Science Edition in Chinese and English), 1982, (1).
对于用非独立态函数描述的受约束系统
其系统的拉氏函数密度和约束条件均含态函数的高阶微商
此系统的对称变换可导致推广的Noether定理
一般地说
这时不产生经典形式Noether定理的守恒量
而在有限约束下
态函数内部对称变换产生的推广Noether定理
可化为无约束的经典形式Noether定理的结果。约束系统的能量动量张量与场方程的关系给予了讨论
并给出了对不可压缩连续介质的一个应用。
The Constrained System whose motion may be described in terms of non.independent State functions.The Lagrangians and Constraint Condit. ions may be involving hiqh-order derivatives.Suppose the action integral and the Constraint Condition are invariant under the Symmetry transform. ation of the tim-space Coordinites and the state function.Then.We Can generalize the Noether's theorem to this Constrained System.In general.It does not yields the Conservatou Lws as Classical Noether's theorem.The translaton invariance and Lorentz invariance yield generalization Conserv. ation of energy-momentum and angular momentum.However
If the System only Subject to a finite Constraint
It does not reduce to the Conservation Law as the non-Constraint
System But if the System Subzect to such Co. nstrint
under the internal Symmetry transformations the generalization Noether's theorem reduce to the results as the non-constraint System.The generalization Cortservation of energy-momentum are equivaleut to the Euler—Lagrange equations of the Constraint System.Our general resnlts may be application to incompressible Continuous media.
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