回旋辐射对宇宙微波背景光谱畸变的影响
On the effect of cyclotron emission on the spectral distortions of the cosmic microwave background
摘要：
通过考虑自发辐射、受激发射受激发射和吸收对光子和能量注入率的贡献，我们研究了与宇宙磁场相关的回旋辐射对CMB谱畸变演化的作用。这些回旋辐射率已在数值上与宇宙等离子体，韧致辐射和双康普顿散射，现实的CMB扭曲的光谱在早期和晚期的相关辐射过程进行了比较。对于合理的磁场强度，我们发现，回旋辐射的贡献是远远小于韧致辐射和双康普顿的贡献，因为它们的不同的频率位置和高韧致辐射和双康普顿的效率，以保持长波长区域的CMB光谱接近黑体（在电子温度下）在形成的光谱失真。从以前的分析中，我们发现，对于一个非常大的一组耗散机制的回旋辐射在CMB光谱失真的演变中的作用是可以忽略不计的，特别是，它不能重新建立一个现实的早期失真的产生后的黑体光谱。在相当一般的假设下，只考虑康普顿散射、韧致辐射和双康普顿，而不考虑耗散过程，就可以推导出不同宇宙时期能量交换的约束条件。最后，估算了回旋辐射引起的CMB偏振度的上限。
英文摘要：
We have investigated the role of the cyclotron emission associated to cosmic magnetic fields on the evolution of CMB spectral distortions by considering the contributions by spontaneous and stimulated emission and by absorption in the computation of the photon and energy injection rates. These cyclotron emission rates have been numerically compared with those of the relevant radiative processes operating in the cosmic plasma, bremsstrahlung and double Compton scattering, for realistic CMB distorted spectra at early and late epochs. For reasonable magnetic field strengths we find that the cyclotron emission contribution is much smaller than the bremsstrahlung and double Compton contributions, because of their different frequency locations and the high bremsstrahlung and double Compton efficiency to keep the long wavelength region of the CMB spectrum close to a blackbody (at electron temperature) during the formation of the spectral distortion. Differently from previous analyses, we find that for a very large set of dissipation mechanisms the role of cyclotron emission in the evolution of CMB spectral distortions is negligible and, in particular, it cannot re-establish a blackbody spectrum after the generation of a realistic early distortion. The constraints on the energy exchanges at various cosmic times can be then derived, under quite general assumptions, by considering only Compton scattering, bremsstrahlung, and double Compton, other than, obviously, the considered dissipation process. Finally, upper limits to the CMB polarization degree induced by cyclotron emission have been estimated.
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