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arXiv 0911.4411astro-ph.CO
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宇宙微波背景和大尺度结构对中微子-暗物质相互作用的约束

Constraints on neutrino -- dark matter interactions from cosmic microwave background and large scale structure data

P. Serra, F. Zalamea, A. Cooray, G. Mangano, A. Melchiorri

摘要:

本文更新了前人对中微子与暗物质非标准相互作用的宇宙学效应的研究。将两种物质之间的弹性散射截面参数化为宇宙温度的函数,由此产生的中微子-暗物质流体具有非零压力,这决定了物质功率谱中的扩散阻尼振荡,类似于光子-重子流体产生的声学振荡。利用宇宙微波背景数据,结合大尺度结构实验结果,我们对相互作用的暗物质组分的比例以及相应的不透明度进行了限制。

英文摘要:

We update a previous investigation of cosmological effects of a non-standard interaction between neutrinos and dark matter. Parameterizing the elastic-scattering cross section between the two species as a function of the temperature of the universe, the resulting neutrino-dark matter fluid has a non-zero pressure, which determines diffusion-damped oscillations in the matter power spectrum similar to the acoustic oscillations generated by the photon-baryon fluid. Using cosmic microwave background data in combination with large scale structure experiment results, we then put constraints on the fraction of the interacting dark matter component as well as on the corresponding opacity.

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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