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

被引：11

作者：

Li Hong ^{[1
,2
]}

Li MingZhe ^{[3
]}

Qiu TaoTao ^{[4
]}

Xia JunQing ^{[1
]}

Piao YunSong ^{[5
]}

Zhang XinMin ^{[6
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[3] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Peoples R China

[4] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China

[5] Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China

[6] Chinese Acad Sci, Inst High Energy Phys, Div Theoret Phys, Beijing 100049, Peoples R China

来源：

SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2014年 / 57卷 / 08期

基金：

中国国家自然科学基金;

关键词：

cosmology parameters; cosmic microwave background; early Universe; CPT symmetry; NATURAL INFLATION; CMB QUADRUPOLE; UNIVERSE; CONSTRAINTS; SPECTRUM; FLATNESS; HORIZON; PHYSICS; PHASE;

D O I：

10.1007/s11433-014-5520-3

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recently BICEP2 collaboration has announced the detection of the primordial gravitational waves at high confidence level. In light of the results of B-modes power spectrum from BICEP2 and using the based ACDM, a constraint on the tensor-to-scalar ratio r = 0.201:g (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% CL.). 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 extra B-modes of CMB polarization, namely by a non-zero polarization rotation angle during its transferring from the last scattering surface.

引用

页码：1431 / 1441

页数：11

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