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arXiv 1209.2299hep-phhep-th
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从弦论寻找轴子和ALP

Searching for axions and ALPs from string theory

Andreas Ringwald

摘要:

我们回顾搜索封闭弦轴子和类轴子粒子(ALP)在IIB弦通量紧化。对于背景通量和TeV标度引力子质量的自然值,大体积方案的模稳定化机制预言存在一个中等标度衰变常数的QCD候选轴子,f_a ~ 10^9...... 10^12 GeV,与包含可见扇区的膜包裹的小循环有关,加上与大循环有关的几乎无质量和几乎解耦的ALP。在可见扇形膜包裹超过两个相交圈的最小数目的设置中,有更多的ALP具有与QCD轴子候选者近似相同的衰变常数和与光子的耦合,但它们以指数方式更轻。在不久的将来,有令人兴奋的现象学机会来寻找这些轴子和ALP。对于f_a ~ 10^11. 10^12 GeV,QCD轴子可以成为暗物质的主要部分,并在利用微波腔的天体观测仪中被检测到。对于f_a ~ 10^9. 10^10 GeV,额外的ALP可以解释天体物理学异常,并在下一代的太阳镜和光穿透墙壁实验中寻找。

英文摘要:

We review searches for closed string axions and axion-like particles (ALPs) in IIB string flux compactifications. For natural values of the background fluxes and TeV scale gravitino mass, the moduli stabilisation mechanism of the LARGE Volume Scenario predicts the existence of a QCD axion candidate with intermediate scale decay constant, f_a ~ 10^9 ... 10^12 GeV, associated with the small cycles wrapped by the branes hosting the visible sector, plus a nearly massless and nearly decoupled ALP associated with the LARGE cycle. In setups where the visible sector branes are wrapping more than the minimum number of two intersecting cycles, there are more ALPs which have approximately the same decay constant and coupling to the photon as the QCD axion candidate, but which are exponentially lighter. There are exciting phenomenological opportunities to search for these axions and ALPs in the near future. For f_a ~ 10^11 ... 10^12 GeV, the QCD axion can be the dominant part of dark matter and be detected in haloscopes exploiting microwave cavities. For f_a ~ 10^9 ... 10^10 GeV, the additional ALPs could explain astrophysical anomalies and be searched for in the upcoming generation of helioscopes and light-shining-through-a-wall experiments.

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