Quadrupole-octopole alignment of CMB related to the primordial power spectrum with dipolar modulation in anisotropic spacetime  

作　　者：常哲 李昕 王赛 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences [2]Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2015年第5期51-59,共9页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11075166,11147176)

摘　　要：The WMAP and Planck observations show that the quadrupole and octopole orientations of the CMB might align with each other. We reveal that the quadrupole-octopole alignment is a natural implication of the primordial power spectrum in an anisotropic spacetime. The primordial power spectrum is presented with a dipolar modulation. We obtain the privileged plane by employing the ＂power tensor＂ technique. At this plane, there is maximum correlation between quadrupole and octopole. The probability for the alignment is much larger than that in the isotropic universe. We find that this model would lead to deviations from the statistical isotropy only for low-l multipoles.The WMAP and Planck observations show that the quadrupole and octopole orientations of the CMB might align with each other. We reveal that the quadrupole-octopole alignment is a natural implication of the primordial power spectrum in an anisotropic spacetime. The primordial power spectrum is presented with a dipolar modulation. We obtain the privileged plane by employing the ＂power tensor＂ technique. At this plane, there is maximum correlation between quadrupole and octopole. The probability for the alignment is much larger than that in the isotropic universe. We find that this model would lead to deviations from the statistical isotropy only for low-l multipoles.

关 键 词：CMB mode alignment anisotropic inflation Finsler geometry 

分 类 号：O572.2[理学—粒子物理与原子核物理]