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arXiv 1102.5292astro-ph.COhep-ph
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自相互作用暗物质能量密度

Self-interacting Dark Matter Energy Density

Rainer Stiele, Tillmann Boeckel, Jurgen Schaffner-Bielich

摘要:

我们研究了弹性暗物质自相互作用对能量密度贡献的宇宙学意义。它的标度行为表明,它可能是早期宇宙中的主要能量贡献。来自原始核合成的约束给出了自相互作用强度的上限,其允许与标准模型强相互作用相同的强度。此外,我们探讨了早期的自我相互作用占主导地位的宇宙的宇宙学后果。化学暗物质解耦要求自相互作用的暗物质粒子相当轻(千电子伏范围),但我们发现,超弱非弹性相互作用预测强弹性暗物质自相互作用。假设第二个,无碰撞的冷暗物质的组成部分,其自然去耦规模超过了弱规模,是符合PAMELA和费米-LAT观察到的电子和正电子过剩。结构形成分析揭示了在自相互作用主导期间的线性增长解,在第一颗恒星形成之前很久就将结构增强到~ 10^(-3)太阳质量。

英文摘要:

We investigate cosmological implications of an energy density contribution arising by elastic dark matter self-interactions. Its scaling behaviour shows that it can be the dominant energy contribution in the early universe. Constraints from primordial nucleosynthesis give an upper limit on the self-interaction strength which allows for the same strength as standard model strong interactions. Furthermore we explore the cosmological consequences of an early self-interaction dominated universe. Chemical dark matter decoupling requires that self-interacting dark matter particles are rather light (keV range) but we find that super-weak inelastic interactions are predicted by strong elastic dark matter self-interactions. Assuming a second, collisionless cold dark matter component, its natural decoupling scale exceeds the weak scale and is in accord with the electron and positron excess observed by PAMELA and Fermi-LAT. Structure formation analysis reveals a linear growing solution during self-interaction domination, enhancing structures up to ~ 10^(-3) solar masses long before the formation of the first stars.

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