A Consistency Relation for the CMB B-mode Polarization in the Squeezed Limit
Cosmology and Nongalactic Astrophysics
2015-06-22 v1
Abstract
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 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.
Cite
@article{arxiv.1407.6223,
title = {A Consistency Relation for the CMB B-mode Polarization in the Squeezed Limit},
author = {A. Kehagias and A. Moradinezhad-Dizgah and J. Noreña and H. Perrier and A. Riotto},
journal= {arXiv preprint arXiv:1407.6223},
year = {2015}
}