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arXiv 1003.2304astro-ph.COhep-ph
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暗物质自相互作用能量密度的宇宙学意义

Cosmological implications of a Dark Matter self-interaction energy density

Rainer Stiele, Tillmann Boeckel, Jürgen Schaffner-Bielich

摘要:

我们调查宇宙学约束的能量密度贡献的弹性暗物质自相互作用的质量的交换粒子和耦合常数。由于在罗伯逊-沃克度规的膨胀行为,我们调查的自我相互作用的暗物质是温暖的热文物的情况下。暗物质自相互作用能量密度的标度行为表明,它可能是(仅)在非常早期的宇宙中的主要贡献。因此,它对原始核合成的影响被用来限制相互作用的强度,我们发现它至少与强相互作用一样强。此外,我们探讨了自相互作用主导的宇宙中的暗物质解耦,这是做了自相互作用的温暖的暗物质以及碰撞冷暗物质在两个组件的情况下。我们发现,强暗物质自相互作用与自相互作用暗物质与重子物质之间的超弱非弹性相互作用并不矛盾,无碰撞冷暗物质退耦的自然尺度超过了弱尺度,并线性依赖于粒子质量.最后,结构形成分析揭示了一个线性增长的解决方案,在自相互作用的优势,但是,只有非宇宙尺度增强。

英文摘要:

We investigate cosmological constraints on an energy density contribution of elastic dark matter self-interactions characterized by the mass of the exchange particle and coupling constant. Because of the expansion behaviour in a Robertson-Walker metric we investigate self-interacting dark matter that is warm in the case of thermal relics. The scaling behaviour of dark matter self-interaction energy density shows that it can be the dominant contribution (only) in the very early universe. Thus its impact on primordial nucleosynthesis is used to restrict the interaction strength, which we find to be at least as strong as the strong interaction. Furthermore we explore dark matter decoupling in a self-interaction dominated universe, which is done for the self-interacting warm dark matter as well as for collisionless cold dark matter in a two component scenario. We find that strong dark matter self-interactions do not contradict super-weak inelastic interactions between self-interacting dark matter and baryonic matter and that the natural scale of collisionless cold dark matter decoupling exceeds the weak scale and depends linearly on the particle mass. Finally structure formation analysis reveals a linear growing solution during self-interaction domination; however, only non-cosmological scales are enhanced.

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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