What can we learn from the tension between PLANCK and BICEP2 data?

What can we learn from the tension between PLANCK and BICEP2 data?
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我们可以从 PLANCK 和 BICEP2 数据之间的紧张关系中学到什么？

DOI：
10.1007/s11433-014-5520-3
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发表时间：
2014-06
期刊：
Science China Physics,Mechanics & Astonomy
影响因子：
--
通讯作者：
ZHANG XinMin
ZHANG XinMin
中科院分区：
其他
文献类型：
--
作者：
LI Hong;LI MingZhe;QIU TaoTao;XIA JunQing;PIAO YunSong;ZHANG XinMin

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最近，BICEP2 合作宣布以高置信度探测到原始引力波。根据 BICEP2 的 B 模功率谱结果并使用基于 ΛCDM 的结果，可以得到张量与标量比 r= 0.20−0.05+0.07（68% C.L.）的约束，然而，该结果与最近 PLANCK 测量的标准膨胀模型的限制存在明显的张力，r < 0.11（95% C.L.）。在此，我们回顾了BICEP2之后宇宙学研究的最新进展，并讨论了协调PLANCK和BICEP2数据之间紧张关系的不同方法。我们将讨论对标准宇宙学模型的可能修改，例如包括标量谱指数或与膨胀宇宙学参数相关的其他宇宙学参数的运行，或者通过引入可以通过弹跳宇宙学预测的截止来在大尺度上倾斜原始功率谱。我们还将评论产生 CMB 偏振的额外 B 模式的另一种可能性，即在从最后一个散射表面转移期间通过非零偏振旋转角。
Recently BICEP2 collaboration has announced the detection of the primordial gravitational waves at high confidence level. In light of the results ofB-modes power spectrum from BICEP2 and using the based ΛCDM, a constraint on the tensor-to-scalar ratior= 0.20−0.05+0.07(68% C.L.) can be obtained, however, this result is in apparent tension with the limit on standard inflation models from the recent PLANCK measurement,r< 0.11 (95% C.L.). Herein we review the recent progress on the cosmological studies after BICEP2 and discuss on different ways of reconciling the tension between PLANCK and BICEP2 data. We will discuss possible modifications on the standard cosmological model, such as including the running of scalar spectral index or other cosmological parameters correlated with inflationary cosmological parameters, or tilting the primordial power spectrum at large scales by introducing a cut off which can be predicted by bouncing cosmology. We will also comment on another possibility of generating extraB-modes of CMB polarization, namely by a non-zero polarization rotation angle during its transferring from the last scattering surface.
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