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arXiv 0807.4587hep-phastro-ph
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CMB辐射中赝标光子混合的特征

Signatures of Pseudoscalar Photon Mixing in CMB Radiation

Nishant Agarwal, Pankaj Jain, Douglas W. McKay, John P. Ralston

摘要:

我们模拟了光子和超轻赝标混合对电磁辐射在河外介质中传播的影响。介质被建模为大量的磁畴,彼此不相关。在小混合角极限下,得到了不同Stokes参量的解析表达式。不同的斯托克斯参数被发现线性增加的领域的数量。我们也验证了这一结果通过直接数值模拟。我们用这种形式估计赝标量光子混合对宇宙微波背景(CMB)极化的影响。我们通过CMB观测值对模型参数施加限制。我们发现,目前允许的参数范围内承认CMB圆偏振阶$10^{-7}$。

英文摘要:

We model the effect of photon and ultra-light pseudoscalar mixing on the propagation of electromagnetic radiation through the extragalactic medium. The medium is modelled as a large number of magnetic domains, uncorrelated with one another. We obtain an analytic expression for the different Stokes parameters in the limit of small mixing angle. The different Stokes parameters are found to increase linearly with the number of domains. We also verify this result by direct numerical simulations. We use this formalism to estimate the effect of pseudoscalar-photon mixing on the Cosmic Microwave Background (CMB) polarization. We impose limits on the model parameters by the CMB observations. We find that the currently allowed parameter range admits a CMB circular polarization up to order $10^{-7}$.

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