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arXiv 0910.2576hep-th
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具有磁场和T-对偶的膜的开弦点和闭弦点

Open and Closed String Vertices for branes with magnetic field and T-duality

I. Pesando

摘要:

我们仔细讨论了描述环面上有磁通量的D-膜上的偶极开弦和闭弦的顶点。沿着闭圈的平移不变性迫使开弦形式主义中令人惊讶的闭弦顶点获得Chan-Paton矩阵。此外,对于规范群中具有磁通量的部分,单圈振幅只有一条迹线。这些特点也需要在开弦扇区的T-对偶的行动的一致性。这样,我们就可以对微扰论中的所有阶证明T-对偶开弦论的等价性,包括引力相互作用。基于Sciuto-Della Selva-Saito顶点理论,我们还提供了一个新的和直接的推导玻色边界态的存在下恒定的磁场和Kalb-Ramond背景。

英文摘要:

We discuss carefully the vertices which describe the dipole open strings and closed strings on a D-brane with magnetic flux on a torus. Translation invariance along closed cycles forces surprisingly closed string vertices written in open string formalism to acquire Chan-Paton like matrices. Moreover the one loop amplitudes have a single trace for the part of gauge group with the magnetic flux. These peculiarities are also required by consistency of the action of T-duality in the open string sector. In this way we can show to all orders in perturbation theory the equivalence of the T-dual open string theories, gravitational interactions included. We provide also a new and direct derivation of the bosonic boundary state in presence of constant magnetic and Kalb-Ramond background based on Sciuto-Della Selva-Saito vertex formalism.

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