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arXiv 1305.3603astro-ph.COastro-ph.HEhep-phhep-th
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寻找0.1-1 keV宇宙轴子背景

Searching for a 0.1-1 keV Cosmic Axion Background

Joseph P. Conlon, M. C. David Marsh

摘要:

弦论模在z \sim 10^{12}处的原初衰变自然会产生能量为0.1 - 1 keV的暗辐射宇宙轴子背景(CAB)。这种CAB可以通过天体物理磁场中的轴子-光子转换来探测,从而在极紫外和软X射线波段产生准热过剩。即使对于\ll 10^{-11} GeV^{-1}的轴子-光子耦合,也可以产生实质性的和可观察的光度。我们认为轴子-光子转换可以解释观测到的星系团中软X射线的过量发射,也可能对弥散未分辨的宇宙X射线背景有贡献。我们列出了一些相关的预测的情况。

英文摘要:

Primordial decays of string theory moduli at z \sim 10^{12} naturally generate a dark radiation Cosmic Axion Background (CAB) with 0.1 - 1 keV energies. This CAB can be detected through axion-photon conversion in astrophysical magnetic fields to give quasi-thermal excesses in the extreme ultraviolet and soft X-ray bands. Substantial and observable luminosities may be generated even for axion-photon couplings \ll 10^{-11} GeV^{-1}. We propose that axion-photon conversion may explain the observed excess emission of soft X-rays from galaxy clusters, and may also contribute to the diffuse unresolved cosmic X-ray background. We list a number of correlated predictions of the scenario.

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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