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arXiv 1302.3707hep-th
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IKKT模型中的膜紧化和4维几何

Brane compactifications and 4-dimensional geometry in the IKKT model

Alexios P. Polychronakos, Harold Steinacker, Jochen Zahn

摘要:

我们详细研究了IKKT矩阵模型中具有紧致额外维数M^4 x K的某些膜解,其中K是嵌入R^6中的二维旋转环面。我们主要研究K \subset R ^[6]的紧化模和涨落及其物理意义。在泊松张量的中介下,它们对膜上的有效四维度规有贡献,从而成为引力自由度。我们表明,零模式对应的全球对称性的模型导致Ricci平坦的4维度量扰动,能量动量张量消失的地方。它们与能量动量张量的耦合依赖于膜的非本征曲率。

英文摘要:

We study in detail certain brane solutions with compact extra dimensions M^4 x K in the IKKT matrix model, with K being a two-dimensional rotating torus embedded in R^6. We focus on the compactification moduli and the fluctuations of K \subset R^6 and their physical significance. Mediated by the Poisson tensor, they contribute to the effective 4-dimensional metric on the brane, and thereby become gravitational degrees of freedom. We show that the zero modes corresponding to the global symmetries of the model lead to Ricci-flat 4-dimensional metric perturbations, wherever the energy-momentum tensor vanishes. Their coupling to the energy momentum tensor depends on the extrinsic curvature of the brane.

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