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arXiv 1602.00237astro-ph.COgr-qchep-ph
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CMB的B模偏振与宇宙中微子背景

The B-mode polarization of CMB and Cosmic Neutrino Background

Rohoollah Mohammadi, Jafar Khodagholizadeh, Mahdi Sadegh, She-Sheng Xue

摘要:

与E模偏振相反,在标量模度规微扰的情况下,康普顿散射不能产生宇宙微波背景的B模偏振。然而,在张量模的度规微扰情况下,康普顿散射有可能产生B模。由于这个原因,度量扰动的张量模式与标量模式的比率($r\sim C_{Bl}/C_{El}$)至少对于小的$l$通过将B模式功率谱与E模式功率谱进行比较来估计。我们研究了宇宙中微子背景(CNB)与CMB之间的弱相互作用引起的CMB偏振,特别是B模偏振,以及标量和张量度规扰动下的康普顿散射。结果表明,B模偏振态的功率谱$C_{Bl}$受到标量模和张量模的贡献,并对$r$参数的取值产生影响.我们还表明,B模偏振功率谱可以作为一个间接的探针到CNB。

英文摘要:

It is known that in contrast with the E-mode polarization, the B-mode polarization of the Cosmic Microwave Background cannot be generated by the Compton scattering in the case of scalar mode of metric perturbation. However it is possible to generate the B-mode by the Compton scattering in the case of tensor mode of metric perturbation. For this reason, the ratio of tensor to scalar modes of metric perturbation ($r\sim C_{Bl}/C_{El}$) is estimated by comparing the B-mode power spectrum with the E-mode at least for small $l$. We study the CMB polarization specially B-mode due to the weak interaction of Cosmic Neutrino Background (CNB) and CMB, in addition to the Compton scattering in both cases of scalar and tensor metric perturbations. It is shown that the power spectrum $C_{Bl}$ of the B-mode polarization receives some contributions from scalar and tensor modes, which have effects on the value of $r$-parameter. We also show that the B-mode polarization power spectrum can be used as an indirect probe into the CNB.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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