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arXiv 0908.1792hep-th
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双场论的规范代数与Courant括号

The gauge algebra of double field theory and Courant brackets

Chris Hull, Barton Zwiebach

摘要:

我们研究了最近提出的双环面上的场论的对称代数,该场论描述了具有动量和缠绕的环面上的闭合弦模。规范参数是二重空间上的约束场,在T-对偶下变换为向量。规范代数定义了一个T-对偶协变括号。对于参数和场是T-对偶的情况下,有动量,但没有绕组,我们发现的规范变换的所有订单,并表明规范代数减少到一个Siegel获得。我们表明,这样的限制参数的括号是柯朗括号。我们解释如何实现这些代数的对称性,尽管失败的雅可比身份。

英文摘要:

We investigate the symmetry algebra of the recently proposed field theory on a doubled torus that describes closed string modes on a torus with both momentum and winding. The gauge parameters are constrained fields on the doubled space and transform as vectors under T-duality. The gauge algebra defines a T-duality covariant bracket. For the case in which the parameters and fields are T-dual to ones that have momentum but no winding, we find the gauge transformations to all orders and show that the gauge algebra reduces to one obtained by Siegel. We show that the bracket for such restricted parameters is the Courant bracket. We explain how these algebras are realised as symmetries despite the failure of the Jacobi identity.

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