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arXiv 0811.0326hep-phastro-ph
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大量隐藏的光子作为不冷不热的暗物质

Massive hidden photons as lukewarm dark matter

Marieke Postma, Javier Redondo

摘要:

我们研究了keV-MeV质量的隐藏光子(HP),即隐藏扇区U(1)规范玻色子,解释观测到的暗物质数量的可能性.我们专注于HP与标准模型部门仅通过与光子的动力学混合相互作用的情况。计算的遗迹丰度包括所有相关的等离子体效应到光子的自能,这导致共振产量几乎独立的HP质量。HP可以衰变为三个光子。此外,如果足够轻,它可以在恒星中大量产生。在考虑宇宙光子背景和恒星演化的情况下,我们发现隐藏光子对暗物质的贡献很小。如果动力学混合以外的另一种生产机制起作用,则可以避免这种负面结论。

英文摘要:

We study the possibility that a keV-MeV mass hidden photon (HP), i.e. a hidden sector U(1) gauge boson, accounts for the observed amount of dark matter. We focus on the case where the HP interacts with the standard model sector only through kinetic mixing with the photon. The relic abundance is computed including all relevant plasma effects into the photon's self-energy, which leads to a resonant yield almost independent of the HP mass. The HP can decay into three photons. Moreover, if light enough it can be copiously produced in stars. Including bounds from cosmic photon backgrounds and stellar evolution, we find that the hidden photon can only give a subdominant contribution to the dark matter. This negative conclusion may be avoided if another production mechanism besides kinetic mixing is operative.

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