A consistency relation for the CMB B-mode polarization in the squeezed limit

被引：2
|
作者：
Kehagias, A. [1 ,2 ,3 ]
Dizgah, A. Moradinezhad [1 ,2 ]
Norena, J. [1 ,2 ]
Perrier, H. [1 ,2 ]
Riotto, A. [1 ,2 ]
机构：
[1] Univ Geneva, Dept Theoret Phys, CH-1211 Geneva 4, Switzerland
[2] Ctr Astroparticle Phys, CH-1211 Geneva 4, Switzerland
[3] Natl Tech Univ Athens, Div Phys, Athens 15780, Greece
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2014年 / 10期
基金：
瑞士国家科学基金会;
关键词：
CMBR polarisation; non-gaussianity; CMBR theory; physics of the early universe; LARGE-SCALE STRUCTURE; SYMMETRIES;
D O I：
10.1088/1475-7516/2014/10/011
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A large-scale temperature perturbation has a non-zero correlation with the power spectrum of B-modes of cosmological origin on short scales while the corresponding correlation is expected to be zero for B-modes sourced by galactic foregrounds. We thus compute the squeezed limit of a three-point function in which one correlates the temperature fluctuations at large scales with two polarization modes at small scales. In the particular case of the B-mode polarization we obtain a relation that connects the squeezed limit of the TBB three-point function with the cosmological B-mode power spectrum, which can be used as a consistency relation. This could in principle help to distinguish a primordial signal from that induced by inter-stellar dust.
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收藏
页数：17
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