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

作者：Kehagias A^*; Dizgah A Moradinezhad; Norena J; Perrier H; Riotto A

来源：Journal of Cosmology and Astroparticle Physics, 2014, 2014(10): 011.

DOI：10.1088/1475-7516/2014/10/011

• CMBR polarisation
• non-gaussianity
• CMBR theory
• physics of the early universe

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.

• 出版日期2014-10