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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1903.04578hep-phastro-ph.CO
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新相互作用引起的CMB圆极化和B模极化

CMB circular and B-mode polarization from new interactions

Nicola Bartolo, Ahmad Hoseinpour, Sabino Matarrese, Giorgio Orlando, Moslem Zarei

摘要:

描述宇宙微波背景(CMB)通过康普顿散射的辐射传输的标准模型预测,线性阶的宇宙标量扰动不能产生V和B偏振模。在这项工作中,我们调查的可能性,这样的CMB偏振模式产生的线性标量扰动的存在下,即使只有。我们提供了一个一般的光子费米子前向散射振幅的参数化和计算不同的CMB偏振模式之间的混合项。我们讨论了违反离散对称性的标准模型相互作用的不同一般扩展,同时保持电荷共轭,宇称和时间反转的组合。我们表明,它是可能的源CMB圆极化违反宇称和电荷共轭对称性。相反,B模式的产生与时间反演的对称性的破坏相关联。我们的结果提供了一个有用的工具来约束新的物理使用CMB数据。

英文摘要:

Standard models describing the radiation transfer of the cosmic microwave background (CMB) through Compton scattering predict that cosmological scalar perturbations at linear order are not able to source V and B polarization modes. In this work, we investigate the possibility that such CMB polarization modes are generated even in the presence of linear scalar perturbations only. We provide a general parametrization of the photon-fermion forward-scattering amplitude and compute mixing terms between different CMB polarization modes. We discuss different general extensions of Standard Model interactions which violate discrete symmetries, while preserving the combination of charge conjugation, parity and time reversal. We show that it is possible to source CMB circular polarization by violating parity and charge conjugation symmetries. Instead, B-mode generation is associated to the violation of symmetry for time-reversal. Our results provide a useful tool to constrain new physics using CMB data.

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