Searching for a 0.1-1 keV Cosmic Axion Background

Searching for a 0.1-1 keV Cosmic Axion Background
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寻找 0.1-1 keV 宇宙轴子背景

DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
M. C. Marsh
M. C. Marsh
中科院分区:
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文献类型:
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作者:
J. Conlon;M. C. Marsh

文献摘要

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弦理论模数在z∼10时的原始衰变自然产生0.1keV能量的暗辐射宇宙轴子背景(CAB)。这种CAB可以通过在天体物理磁场中的轴光子转换来探测到,从而在极端紫外线和软X射线波段产生准热过量。即使对于轴子-光子耦合≪10GeV,也可以产生可观的亮度。我们认为,轴子-光子转换可以解释星系团观测到的软X射线的过量发射,也可能是漫射的未分辨宇宙X射线背景的原因。我们列出了对这一情景的一些相关预测。
Primordial decays of string theory moduli at z ∼ 10 naturally generate a dark radiation Cosmic Axion Background (CAB) with 0.1 1 keV energies. This CAB can be detected through axionphoton 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 ≪ 10GeV. 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.