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arXiv 0904.3933astro-ph.COastro-ph.HEhep-ph
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原晕对暗物质共振湮灭的限制

Protohalo Constraints to the Resonant Annihilation of Dark Matter

Francis-Yan Cyr-Racine, Stefano Profumo, Kris Sigurdson

摘要:

最近有人认为,PAMELA,ATIC和PPB-BETS数据显示的异常过剩的高能宇宙射线正电子和电子可能被解释为暗物质湮灭在星系晕与截面共振增强相比,其值在原始等离子体。我们发现,一个非常大的湮灭截面的闪光的高能光子和电子-正电子对预期的暗物质湮灭在第一个原晕,在红移z~40的形式可能是实质性的和可观察的。因此,允许注入原始气体的能量和弥散伽马射线背景的能量密度的界限引起了对低速暗物质截面的限制,这可能难以与PAMELA,ATIC和PPB-BETS结果的解释相一致。

英文摘要:

It has recently been argued that the PAMELA, ATIC and PPB-BETS data showing an anomalous excess of high-energy cosmic ray positrons and electrons might be explained by dark matter annihilating in the Galactic halo with a cross section resonantly enhanced compared to its value in the primeval plasma. We find that with a very large annihilation cross section the flash of energetic photons and electron-positron pairs expected from dark-matter annihilation in the first protohalos that form at redshift z~40 is likely substantial and observable. As a consequence, bounds on the allowed energy injection into the primordial gas and the energy density of the diffuse gamma-ray background give rise to limits on the low-velocity dark matter cross section that can be difficult to reconcile with this interpretation of the PAMELA, ATIC and PPB-BETS results.

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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