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arXiv 0901.3893hep-thmath-phmath.MP
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改进的广义Hamilton算子及局部对称性的搜索

Improved extended Hamiltonian and search for local symmetries

A. A. Deriglazov

摘要:

我们分析了一个结构的奇异拉格朗日$L$的第一和第二类约束的任意阶段。我们发现,存在一个等价的拉格朗日(称为扩展拉格朗日$\tilde L$),产生所有的原始约束的第二阶段的Dirac-Bergmann过程。通过初始拉格朗日量得到了封闭形式的扩展拉格朗日量。形式主义意味着一个辅助变量的原始配置空间的扩展。其中一些被确定与规范场提供局部对称性的$\tilde L$。作为该方法的一个应用,我们通过第一类约束得到了$\tilde L$规范生成元的封闭表达式。事实证明,这是更容易的任务,因为那些为$L$。$L$的所有第一类约束都是$\tilde L$的规范对称性生成元。通过这种方法,具有局部参数的高阶导数的$L$的局部对称性分解为$\tilde L$的规范对称性的和。在拉格朗日框架下证明了狄拉克猜想。

英文摘要:

We analyze a structure of the singular Lagrangian $L$ with first and second class constraints of an arbitrary stage. We show that there exist an equivalent Lagrangian (called the extended Lagrangian $\tilde L$) that generates all the original constraints on second stage of the Dirac-Bergmann procedure. The extended Lagrangian is obtained in closed form through the initial one. The formalism implies an extension of the original configuration space by auxiliary variables. Some of them are identified with gauge fields supplying local symmetries of $\tilde L$. As an application of the formalism, we found closed expression for the gauge generators of $\tilde L$ through the first class constraints. It turns out to be much more easy task as those for $L$. All the first class constraints of $L$ turn out to be the gauge symmetry generators of $\tilde L$. By this way, local symmetries of $L$ with higher order derivatives of the local parameters decompose into a sum of the gauge symmetries of $\tilde L$. It proves the Dirac conjecture in the Lagrangian framework.

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