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arXiv 0810.5126hep-phastro-ph
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暗物质与暗辐射

Dark Matter and Dark Radiation

Lotty Ackerman, Matthew R. Buckley, Sean M. Carroll, Marc Kamionkowski

摘要:

我们探讨了一个新的长程U(1)规范场(“暗电磁”)的可行性和天体物理学后果,该规范场只与暗物质耦合,而不与标准模型耦合。暗物质在新作用力下由相等数量的正电荷和负电荷组成,但如果暗物质质量足够高,暗精细结构常数$\hatα$足够小,则湮灭被抑制。如果暗物质也耦合到传统的弱相互作用,可以得到正确的遗迹丰度,我们验证了这是符合粒子物理学的约束。$\hatα$的主要限制来自于要求暗物质在星系动力学中有效地无碰撞,这意味着$\hatα\lesssim 10^{-4}$适用于TeV尺度的暗物质。这些值很容易与结构形成和原始核合成的约束相容。我们提出了有趣的新的等离子体效应在暗物质动力学的前景,这仍有待探索。

英文摘要:

We explore the feasibility and astrophysical consequences of a new long-range U(1) gauge field ("dark electromagnetism") that couples only to dark matter, not to the Standard Model. The dark matter consists of an equal number of positive and negative charges under the new force, but annihilations are suppressed if the dark matter mass is sufficiently high and the dark fine-structure constant $\hatα$ is sufficiently small. The correct relic abundance can be obtained if the dark matter also couples to the conventional weak interactions, and we verify that this is consistent with particle-physics constraints. The primary limit on $\hatα$ comes from the demand that the dark matter be effectively collisionless in galactic dynamics, which implies $\hatα\lesssim 10^{-4}$ for TeV-scale dark matter. These values are easily compatible with constraints from structure formation and primordial nucleosynthesis. We raise the prospect of interesting new plasma effects in dark matter dynamics, which remain to be explored.

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