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arXiv 1201.4850hep-thastro-ph.COgr-qchep-ph
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宇宙超弦与Kaluza-Klein模

Cosmic Super-Strings and Kaluza-Klein Modes

Jean-Francois Dufaux

摘要:

宇宙超弦一般与相对较轻的塔和/或与内部空间几何相关的强耦合卡鲁扎-克莱因(KK)模式相互作用。本文研究了自旋为2的KK粒子由宇宙F弦和D弦环上的尖点产生的情况。我们认为宇宙超弦要么位于弯曲喉道的底部,要么位于大体积的平坦内部空间。在这两种情况下,KK模式的尖点发射的总能量是相当的,尽管产生的KK模式的数量可能会有很大的不同。然后,我们表明,KK发射的光分解的轻元素和观测的漫射伽马射线背景的约束。我们表明,这排除了宇宙超弦的参数空间的区域,是互补的区域,可以探测当前和即将到来的引力波实验。KK模在摩擦主导的宇宙超弦演化中也将发挥重要作用。

英文摘要:

Cosmic super-strings interact generically with a tower of relatively light and/or strongly coupled Kaluza-Klein (KK) modes associated with the geometry of the internal space. In this paper, we study the production of spin-2 KK particles by cusps on loops of cosmic F- and D-strings. We consider cosmic super-strings localized either at the bottom of a warped throat or in a flat internal space with large volume. The total energy emitted by cusps in KK modes is comparable in both cases, although the number of produced KK modes may differ significantly. We then show that KK emission is constrained by the photo-dissociation of light elements and by observations of the diffuse gamma ray background. We show that this rules out regions of the parameter space of cosmic super-strings that are complementary to the regions that can be probed by current and upcoming gravitational wave experiments. KK modes are also expected to play an important role in the friction-dominated epoch of cosmic super-string evolution.

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