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arXiv 0901.2556hep-phastro-ph.CO
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惰性偶极模型暗物质的正电子和反质子

Positrons and antiprotons from inert doublet model dark matter

Emmanuel Nezri, Michel H. G. Tytgat, Gilles Vertongen

摘要:

在标准模型的一个非常简单的扩展--惰性双态模型的框架下,我们研究了标量暗物质粒子湮灭产生的宇宙射线中反物质的产生和传播。我们考虑三个基准候选人,所有符合WMAP宇宙丰度和现有的直接检测实验,并面对最近的PAMELA,ATIC和HESS数据的模型的预测。对于一个轻的候选人,M_{DM} = 10 GeV,我们认为,正电子和反质子通量可能很大,但仍然符合预期的背景,除非有一个增强(助推因子)的局部密度的暗物质。也有大量的反氘核通量,可能在未来的实验中观察到。对于M_{DM} = 70 GeV的候选者,对正电子和反质子通量的贡献比预期的背景小得多。即使激发因子被用来增强信号,候选人也无法解释观察到的正电子和反质子过剩。最后,对于一个重的候选者,M_{DM} = 10 TeV,它是可能的,以适应PAMELA过剩(但不幸的是,不是ATIC之一)提供了一个大的增强,无论是在本地密度的暗物质或通过索末菲效应。

英文摘要:

In the framework of the Inert Doublet Model, a very simple extension of the Standard Model, we study the production and propagation of antimatter in cosmic rays coming from annihilation of a scalar dark matter particle. We consider three benchmark candidates, all consistent with the WMAP cosmic abundance and existing direct detection experiments, and confront the predictions of the model with the recent PAMELA, ATIC and HESS data. For a light candidate, M_{DM} = 10 GeV, we argue that the positron and anti-proton fluxes may be large, but still consistent with expected backgrounds, unless there is an enhancement (boost factor) in the local density of dark matter. There is also a substantial anti-deuteron flux which might be observable by future experiments. For a candidate with M_{DM} = 70 GeV, the contribution to positron and anti-proton fluxes is much smaller than the expected backgrounds. Even if a boost factor is invoked to enhance the signals, the candidate is unable to explain the observed positron and anti-proton excesses. Finally, for a heavy candidate, M_{DM} = 10 TeV, it is possible to fit the PAMELA excess (but, unfortunately, not the ATIC one) provided there is a large enhancement, either in the local density of dark matter or through the Sommerfeld effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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