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arXiv 0903.4160gr-qcastro-ph.CO
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高频引力波背景与大尺度磁场相互作用的极限

Limits on high-frequency gravitational wave background from its interplay with large scale magnetic fields

M. S. Pshirkov, D. Baskaran

摘要:

在这项工作中,我们分析了在大尺度磁场存在下引力子到光子转换的含义。我们考虑了与星系团有关的磁场,大尺度结构中的细丝,以及原始磁场。{We分析这些磁场与可能存在于宇宙中的外源高频引力波(HFGW)背景的相互作用。我们表明,在存在的磁场,一个足够强的HFGW背景将导致一个可观察到的签名频谱的宇宙微波背景(CMB)。当前CMB实验的灵敏度允许对HFGW背景$Ω_{GW}\lesssim1$的强度施加显著约束。在该频率区域中,这些限制比当前存在的直接约束强大约25个数量级。

英文摘要:

In this work, we analyze the implications of graviton to photon conversion in the presence of large scale magnetic fields. We consider the magnetic fields associated with galaxy clusters, filaments in the large scale structure, as well as primordial magnetic fields. {We analyze the interaction of these magnetic fields with an exogenous high-frequency gravitational wave (HFGW) background which may exist in the Universe. We show that, in the presence of the magnetic fields, a sufficiently strong HFGW background would lead to an observable signature in the frequency spectrum of the Cosmic Microwave Background (CMB).} The sensitivity of current day CMB experiments allows to place significant constraints on the strength of HFGW background, $Ω_{GW}\lesssim1$. These limits are about 25 orders of magnitude stronger {than currently existing direct constraints} in this frequency region.

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