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Induced gravity on intersecting brane worlds: Maximally symmetric solutions

机译:相交的皮层世界上的感应重力:最大对称解

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摘要

We explore models of intersecting brane-worlds with induced gravity terms on\udcodimension one branes and on their intersection. Maximally symmetric solutions\udfor the branes and the intersection are found. We find new self-accelerating\udsolutions. In a 6d spacetime, the solutions realize the see-saw modification of\udgravity where the UV scale of the modification to 4d gravity is determined by\ud6d Planck scale given by $M_6 \sim 10^-3$eV and the IR scale of the\udmodification is determined by $M_6^2/M_4 \sim H_0 \sim 10^-42$ GeV where\ud$H_0$ is present-day Hubble scale. We find that it is increasingly difficult to\udconstruct phenomenologically viable models in higher-dimensional spacetime due\udto the necessity to have the lower value for the fundamental Planck scale to\udrealize the late time acceleration. It is found that the system also admits\udself-tuning solutions where the tension at the intersection does not change the\udgeometry of the intersection. The induced gravity terms can avoid the necessity\udto compactify the extra dimensions. Finally, we discuss the possibility to have\udordinary matter at the intersection, without introducing any regularisation,\udusing the induced gravity terms.
机译:我们探索在\ udcodimension 1上及其交点上具有诱导引力项的相交的braine世界的模型。找到了关于黄铜和交点的最大对称解\ ud。我们找到了新的自我加速\解决方案。在6d时空中,解决方案实现了\ udgravity的跷跷板修改,其中对$ 4d重力的修改的UV比例由\ ud6d普朗克比例由$ M_6 \ sim 10 ^ -3 $ eV和\ udmodification由$ M_6 ^ 2 / M_4 \ sim H_0 \ sim 10 ^ -42 $ GeV确定,其中\ ud $ H_0 $是当今的哈勃尺度。我们发现,由于必须在普朗克尺度上使用较低的值来实现后期加速,因此在高维时空中难以构造“现象学上可行的”模型变得越来越困难。发现该系统还接受了\ uself-tuning解,其中交点处的张力不会改变交点的\预算。引力项可以避免压缩额外尺寸的必要性。最后,我们使用诱导引力项讨论了在交叉口处具有非常规物质而不引入任何正则化的可能性。

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