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arXiv 0908.0953hep-thgr-qc
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代数弦作用的典范分析

Canonical Analysis of Algebraic String Actions

Winston J. Fairbairn, Karim Noui, Francesco Sardelli

摘要:

我们调查规范方面的代数一阶制定字符串介绍了二十年前Balachandran和合作者。我们稍微扩大拉格朗日框架,并显示存在的自对偶制定和Immirzi型参数让人想起四维一阶引力。我们执行一个完整的哈密顿分析的自对偶的情况下:我们提取的第一类约束,并构造狄拉克括号相关联的第二类约束。第一类约束包含世界表上的同构代数,并且坐标关于Dirac括号是非交换的。在一个特定的规范中的Hamilton方程再现弦坐标的波动方程。在一般情况下,非自对偶的情况下,我们也明确的第一类约束的系统,并表明,不同于自对偶制定,该理论承认一个额外的传播自由度比传统的弦论的两个自由度。这防止了一般代数字符串严格等价于Nambu-Goto字符串。

英文摘要:

We investigate the canonical aspects of the algebraic first order formulation of strings introduced two decades ago by Balachandran and collaborators. We slightly enlarge the Lagrangian framework and show the existence of a self-dual formulation and of an Immirzi-type parameter reminiscent of four-dimensional first order gravity. We perform a full Hamiltonian analysis of the self-dual case: we extract the first class constraints and construct the Dirac bracket associated to the second class constraints. The first class constraints contain the diffeomorphisms algebra on the world-sheet, and the coordinates are shown to be non-commutative with respect to the Dirac bracket. The Hamilton equations in a particular gauge are shown to reproduce the wave equation for the string coordinates. In the general, non-self-dual case, we also explicit the first class constraints of the system and show that, unlike the self-dual formulation, the theory admits an extra propagating degree of freedom than the two degrees of freedom of conventional string theory. This prevents the general algebraic string from being strictly equivalent to the Nambu-Goto string.

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