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arXiv 1306.3580hep-th
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Dirac猜想与拉格朗日量的非唯一性

The Dirac Conjecture and the Non-uniqueness of Lagrangian

Yong-Long Wang, Chang-Tan Xu, Hua Jiang, Wei-Tao Lu, Hong-Zhe Pan, Hong-Shi Zong

摘要:

通过逐步将所有约束的总时间导数加到拉格朗日量上,我们实现了Dirac猜想的进一步工作。至此,狄拉克猜想得到了完整的证明。值得注意的是,将总时间导数添加到拉格朗日量可以发现隐藏在原始拉格朗日量中的一些约束。对于约束系统,扩展的哈密顿量$H_E$比全哈密顿量$H_T$考虑了更多的约束条件,具有更明显的对称性.在拉格朗日形式中,我们重新考虑了Cawley反例,并给出了一个例子,在这个例子中,根据其原拉格朗日量,其扩展的哈密顿量优于其全哈密顿量。

英文摘要:

By adding the total time derivatives of all the constraints to the Lagrangian step by step, we achieve the further work of the Dirac conjecture left by Dirac. Hitherto, the Dirac conjecture is proved completely. It is worth noticing that the addition of the total time derivatives to the Lagrangian can turn up some constraints hiding in the original Lagrangian. For a constrained system, the extended Hamiltonian $H_E$ considers more constraints, and shows symmetries more obviously than the total Hamiltonian $H_T$. In the Lagrangian formalism, we reconsider the Cawley counterexample, and offer an example in which in accordance with its original Lagrangian its extended Hamiltonian is better than its total Hamiltonian.

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