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arXiv 1312.7488hep-phastro-ph.CO
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用双标量暗物质模型对银河系中心低能$γ$射线过剩和费米泡的可能解释

A Possible Explanation of Low Energy $γ$-ray Excess from Galactic Centre and Fermi Bubble by a Dark Matter Model with Two Real Scalars

Kamakshya Prasad Modak, Debasish Majumdar, Subhendu Rakshit

摘要:

我们推广多组分暗物质(DM)的想法来解释直接和间接检测实验的结果。在这些模型中,由于每个DM候选者对遗迹丰度的贡献被求和以满足$Ω_{\rm DM}$的WMAP/Planck测量,因此这些候选者与单组分DM模型相比具有更大的湮灭截面。这导致在DM的间接检测实验中更大的$γ$射线通量。我们说明了这一事实,通过引入一个额外的标量流行的单实数标量DM模型。我们还详细计算了该模型的真空稳定性边界、微扰么正性和平凡性约束。由于直接检测的实验结果仍然显示出一些冲突,我们保留了我们的选择,讨论了不同的情况下,不同的DM质量区。在我们的模型框架中,我们做了一个有趣的观察:现有的直接探测实验,如CDMS II,CoGeNT,CRESST II,XENON 100或LUX,加上FGST对银河系中心和费米泡的过量低能$γ$ -射线的观测,已经有能力区分不同的DM晕轮廓。

英文摘要:

We promote the idea of multi-component Dark Matter (DM) to explain results from both direct and indirect detection experiments. In these models as contribution of each DM candidate to relic abundance is summed up to meet WMAP/Planck measurements of $Ω_{\rm DM}$, these candidates have larger annihilation cross-sections compared to the single-component DM models. This results in larger $γ$-ray flux in indirect detection experiments of DM. We illustrate this fact by introducing an extra scalar to the popular single real scalar DM model. We also present detailed calculations for the vacuum stability bounds, perturbative unitarity and triviality constraints on this model. As direct detection experimental results still show some conflict, we kept our options open, discussing different scenarios with different DM mass zones. In the framework of our model we make an interesting observation: The existing direct detection experiments like CDMS II, CoGeNT, CRESST II, XENON 100 or LUX together with the observation of excess low energy $γ$-ray from Galactic Centre and Fermi Bubble by FGST already have the capability to distinguish between different DM halo profiles.

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