arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.4664hep-th
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双场论

Double Field Theory

Chris Hull, Barton Zwiebach

摘要:

环面上闭弦的零模--环面坐标加上与缠绕数共轭的对偶坐标--参于一个双环面。在闭弦场论中,弦场依赖于所有的零模,因此可以扩展为在双环面上给出无限多的场。我们利用弦场论建立了二重环面上的无质量场理论。这种一致性的关键是由闭弦论中的L_0 - \bar L_0=0条件引起的场和规范参数的约束。这种双场论的对称性包括通常的和“对偶双态”,以及作用于对环面坐标和对偶坐标有明确依赖性的场的T-对偶。我们发现,随着重力,一个Kalb-Ramond场和一个非线性子必须添加到支持通常和对偶的非线性同态。我们构造了一个完全一致的和规范不变的作用量的两倍环面三次。我们讨论了在建设全非线性理论所面临的挑战。我们强调,双重几何是物理的和双维度不应被视为一个辅助结构或规范的文物。

英文摘要:

The zero modes of closed strings on a torus --the torus coordinates plus dual coordinates conjugate to winding number-- parameterize a doubled torus. In closed string field theory, the string field depends on all zero-modes and so can be expanded to give an infinite set of fields on the doubled torus. We use the string field theory to construct a theory of massless fields on the doubled torus. Key to the consistency is a constraint on fields and gauge parameters that arises from the L_0 - \bar L_0=0 condition in closed string theory. The symmetry of this double field theory includes usual and 'dual diffeomorphisms', together with a T-duality acting on fields that have explicit dependence on the torus coordinates and the dual coordinates. We find that, along with gravity, a Kalb-Ramond field and a dilaton must be added to support both usual and dual diffeomorphisms. We construct a fully consistent and gauge invariant action on the doubled torus to cubic order in the fields. We discuss the challenges involved in the construction of the full nonlinear theory. We emphasize that the doubled geometry is physical and the dual dimensions should not be viewed as an auxiliary structure or a gauge artifact.

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