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arXiv math-ph/9904028math-phmath.MP
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哈密顿含时力学中的约束

Constraints in Hamiltonian time-dependent mechanics

G. Giachetta, L. Mangiarotti, G. Sardanashvily

摘要:

在哈密顿含时力学中,泊松括号不定义动力学方程,这意味着描述含时完整约束的相应特性。在保守力学中,可以考虑约束的泊松括号,将它们分离为第一类和第二类约束,构造Koszul-Tate解和BRST复形。然而,约束的泊松括号和哈密顿量是没有意义的。第一类约束的哈密顿向量场不是规范变换的生成元。在拉格朗日约束的情况下,我们状态的拉格朗日方程的几乎正则拉格朗日方程的解和相关的哈密顿形式,它生活在拉格朗日约束空间中的汉密尔顿方程的解之间的全面关系。详细研究了退化二次拉格朗日系统。我们构造了这些系统的拉格朗日约束的Koszul-Tate决议的显式形式。

英文摘要:

In Hamiltonian time-dependent mechanics, the Poisson bracket does not define dynamic equations, that implies the corresponding peculiarities of describing time-dependent holonomic constraints. As in conservative mechanics, one can consider the Poisson bracket of constraints, separate them in first and second class constraints, construct the Koszul-Tate resolution and a BRST complex. However, the Poisson bracket of constraints and a Hamiltonian makes no sense. Hamiltonian vector fields for first class constraints are not generators of gauge transformations. In the case of Lagrangian constraints, we state the comprehensive relations between solutions of the Lagrange equations for an almost regular Lagrangian and solutions of the Hamilton equations for associated Hamiltonian forms, which live in the Lagrangian constraint space. Degenerate quadratic Lagrangian systems are studied in details. We construct the Koszul-Tate resolution for Lagrangian constraints of these systems in an explicit form.

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