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arXiv 1606.00769hep-thgr-qc
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IKKT模型协变量子空间上的突现引力

Emergent gravity on covariant quantum spaces in the IKKT model

Harold C. Steinacker

摘要:

研究了在IKKT或IIB矩阵模型中以四维模糊球为背景的扰动问题。规范场和度规涨落被确定在具有最低自旋的激发模式之间,由较高自旋场的塔补充。它们产生于一个内部结构,这个内部结构可以被看作是$S^4$上的扭曲丛,导致了一个协变的非对易几何。在一定条件下,由经典的矩阵模型作用量得到了线性化的四维爱因斯坦方程,并通过IR截断进行了修正。一些单圈的贡献,有效的行动计算使用弦状态的形式主义。

英文摘要:

We study perturbations of 4-dimensional fuzzy spheres as backgrounds in the IKKT or IIB matrix model. Gauge fields and metric fluctuations are identified among the excitation modes with lowest spin, supplemented by a tower of higher-spin fields. They arise from an internal structure which can be viewed as a twisted bundle over $S^4$, leading to a covariant noncommutative geometry. The linearized 4-dimensional Einstein equations are obtained from the classical matrix model action under certain conditions, modified by an IR cutoff. Some one-loop contributions to the effective action are computed using the formalism of string states.

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