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arXiv 1102.5235astro-ph.CO
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大尺度相干磁场:与自由流粒子的相互作用和来自CMB的限制

A large scale coherent magnetic field: interactions with free streaming particles and limits from the CMB

Julian Adamek, Ruth Durrer, Elisa Fenu, Marc Vonlanthen

摘要:

我们研究了均匀磁场渗透的均匀近似各向同性宇宙。与各向同性流体一起,均匀的磁场,这是各向异性的主要来源,导致了一个平面对称的比安基I模型的宇宙。然而,当存在自由流动的相对论粒子时,它们会产生各向异性的压力,抵消来自磁场的压力,从而使宇宙变得各向同性。我们表明,由于这种效应,CMB温度各向异性从一个均匀的磁场显着抑制,如果中微子质量小于0.3 eV。

英文摘要:

We study a homogeneous and nearly-isotropic Universe permeated by a homogeneous magnetic field. Together with an isotropic fluid, the homogeneous magnetic field, which is the primary source of anisotropy, leads to a plane-symmetric Bianchi I model of the Universe. However, when free-streaming relativistic particles are present, they generate an anisotropic pressure which counteracts the one from the magnetic field such that the Universe becomes isotropized. We show that due to this effect, the CMB temperature anisotropy from a homogeneous magnetic field is significantly suppressed if the the neutrino masses are smaller than 0.3 eV.

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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