arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.10074astro-ph.COgr-qchep-ph
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CMB中的轴子超辐射印记

Imprints of Axion Superradiance in the CMB

Diego Blas, Samuel J. Witte

摘要:

轻轴子($m_a \lesssim 10^{-10}$ eV)可以通过一种称为旋转超辐射的机制在快速旋转的天体物理学黑洞周围形成稠密的云。轴子和光子之间的耦合引起了一个参数共振,由轴子云的受激衰变引起,它可以迅速将大轴子数密度的区域转换为低能光子的巨大通量。在这项工作中,我们考虑的现象学意义的超辐射轴子云进行共振衰变。我们表明,从这样的事件产生的低能量光子将被吸收在宇宙学短距离,可能会引起大规模的冲击波,加热和加热的IGM超过Mpc尺度。这些冲击波可能以各向异性光谱畸变或光学深度中的不均匀特征的形式留下可观察到的印记。

英文摘要:

Light axions ($m_a \lesssim 10^{-10}$ eV) can form dense clouds around rapidly rotating astrophysical black holes via a mechanism known as rotational superradiance. The coupling between axions and photons induces a parametric resonance, arising from the stimulated decay of the axion cloud, which can rapidly convert regions of large axion number densities into an enormous flux of low-energy photons. In this work we consider the phenomenological implications of a superradiant axion cloud undergoing resonant decay. We show that the low energy photons produced from such events will be absorbed over cosmologically short distances, potentially inducing massive shockwaves that heat and ionize the IGM over Mpc scales. These shockwaves may leave observable imprints in the form of anisotropic spectral distortions or inhomogeneous features in the optical depth.

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