Searching for a 0.1-1 keV Cosmic Axion Background
Searching for a 0.1-1 keV Cosmic Axion Background
复制标题
寻找 0.1-1 keV 宇宙轴子背景
DOI:
--
复制
发表时间:
2013
期刊:
影响因子:
--
通讯作者:
M. C. Marsh
中科院分区:
文献类型:
--
作者:
J. Conlon;M. C. Marsh
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.