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

作　　者：LI Hong LI MingZhe QIU TaoTao XIA JunQing PIAO YunSong ZHANG XinMin 

机构地区：[1]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics, Chinese Academy of Science [2]National Astronomical Observatories,Chinese Academy of Sciences [3]Interdisciplinary Center for Theoretical Study, University of Science and Technology of China [4]Institute of Astrophysics, Central China Normal University [5]School of Physics, University of Chinese Academy of Sciences [6]Theoretical Physics Division,Institute of High Energy Physics, Chinese Academy of Sciences

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第8期1431-1441,共11页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11033005, 11322325, 11075074, 11121092, 11033005 and 11375202);the National Basic Research Program of China (Grant No. 2010CB83300);the Program for New Century Excellent Talents in University;the National Youth Thousand Talents Program and the Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences (Grant No. XDB09000000)

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 = 0.20-0.05＋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 extra B-modes of CMB polarization, namely by a non-zero polarization rotation angle during its transferring from the last scattering surface.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 basedΛCDM,a constraint on the tensor-to-scalar ratio r=0.20+0.07-0.05(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 extra B-modes of CMB polarization,namely by a non-zero polarization rotation angle during its transferring from the last scattering surface.

关 键 词：cosmology parameters cosmic microwave background early Universe CPT symmetry 

分 类 号：P159[天文地球—天文学]