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arXiv 0812.0522astro-phhep-ph
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用同步辐射和逆康普顿辐射区分宇宙$e^\pm$过剩的不同方案

Discriminating different scenarios to account for the cosmic $e^\pm$ excess by synchrotron and inverse Compton radiation

Juan Zhang, Xiao-jun Bi, Jia Liu, Si-Ming Liu, Peng-fei Yin, Qiang Yuan, Shou-hua Zhu

摘要:

本文介绍了PAMELA最近测量的宇宙正电子分数的过剩和ATIC、PPB-BETS、Fermi和H.E.S. S等电子能谱的过剩。表明存在初级电子和正电子源。可能的解释包括暗物质湮灭、衰变和天体物理学起源,比如暗物质星。在这项工作中,我们表明,这三个方案都可以解释宇宙$e^\pm$过剩的实验结果。然而,通过电子和正电子的局部测量来区分这些不同的情况可能是困难的。我们提出了可能的歧视,这些方案之间通过同步辐射和逆康普顿辐射的初级电子/正电子从该地区接近银河系中心。以典型的配置,我们发现这三种方案预测相当不同的光谱和天空图的同步辐射和逆康普顿辐射,虽然有相对较大的不确定性。最显著的差异来自同步辐射的能带$10^4\sim 10^9$ MHz和逆康普顿辐射的能带$\gtrsim 10$ GeV。在未来,如果有高精度的同步加速器和扩散$γ$射线天空图,它可能至少能够将湮灭暗物质的场景与其他两个场景区分开来。

英文摘要:

The excesses of the cosmic positron fraction recently measured by PAMELA and the electron spectra by ATIC, PPB-BETS, Fermi and H.E.S.S. indicate the existence of primary electron and positron sources. The possible explanations include dark matter annihilation, decay, and astrophysical origin, like pulsars. In this work we show that these three scenarios can all explain the experimental results of the cosmic $e^\pm$ excess. However, it may be difficult to discriminate these different scenarios by the local measurements of electrons and positrons. We propose possible discriminations among these scenarios through the synchrotron and inverse Compton radiation of the primary electrons/positrons from the region close to the Galactic center. Taking typical configurations, we find the three scenarios predict quite different spectra and skymaps of the synchrotron and inverse Compton radiation, though there are relatively large uncertainties. The most prominent differences come from the energy band $10^4\sim 10^9$ MHz for synchrotron emission and $\gtrsim 10$ GeV for inverse Compton emission. It might be able to discriminate at least the annihilating dark matter scenario from the other two given the high precision synchrotron and diffuse $γ$-ray skymaps in the future.

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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