arXiv 1408.02862014-08hep-phhep-th

高尺度超对称的keV弦轴子

A keV String Axion from High Scale Supersymmetry

Brian Henning, John Kehayias, Hitoshi Murayama, David Pinner, Tsutomu T. Yanagida

备注：: 12 pages with 2 appendices; v2: updates to emphasize general results, other minor updates, matches published version
发表信息：: Phys. Rev. D 91, 045036 (2015)
DOI：: 10.1103/PhysRevD.91.045036

摘要：

各种理论和实验上的考虑激发了具有高尺度超对称性破缺的模型。虽然这样的模型可能很难在对撞机中进行测试，但我们建议在低得多的能量下寻找签名。我们表明，keV线的X射线光谱的星系团（如最近有争议的3.5 keV观测）可以有它的起源在一个普遍的弦轴子耦合到一个隐藏的超对称性破缺部门。弦轴子和隐藏扇区中的附加轴子的线性组合仍然很轻，通过超对称破缺动力学获得10千电子伏的质量。为了解释X射线谱线，超对称破缺的尺度必须约为$10^{11-12}$ GeV。这激发了高尺度超对称性，如纯引力中介或最小分裂超对称，并且与所有当前限制一致。由于轴子质量是由动力学质量尺度控制的，因此在膨胀期间，这个质量可以高得多，避免了与高尺度膨胀相关的等曲率（和畴壁）问题。在附录中，我们提出了一种机制，为稳定的质子，另外导致$\mathcal{O}(1)$修改的异常调解的高吉诺质量。

英文摘要：

Various theoretical and experimental considerations motivate models with high scale supersymmetry breaking. While such models may be difficult to test in colliders, we propose looking for signatures at much lower energies. We show that a keV line in the X-ray spectrum of galaxy clusters (such as the recently disputed 3.5 keV observation) can have its origin in a universal string axion coupled to a hidden supersymmetry breaking sector. A linear combination of the string axion and an additional axion in the hidden sector remains light, obtaining a mass of order 10 keV through supersymmetry breaking dynamics. In order to explain the X-ray line, the scale of supersymmetry breaking must be about $10^{11-12}$ GeV. This motivates high scale supersymmetry as in pure gravity mediation or minimal split supersymmetry and is consistent with all current limits. Since the axion mass is controlled by a dynamical mass scale, this mass can be much higher during inflation, avoiding isocurvature (and domain wall) problems associated with high scale inflation. In an appendix we present a mechanism for dilaton stabilization that additionally leads to $\mathcal{O}(1)$ modifications of the gaugino mass from anomaly mediation.

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