TY - JOUR

T1 - A consistency relation for the CMB B-mode polarization in the squeezed limit

AU - Kehagias, A.

AU - Dizgah, A. Moradinezhad

AU - NOREÑA SANCHEZ, JORGE IVAN

AU - Perrier, H.

AU - Riotto, A.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - 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.

AB - 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.

KW - CMBR polarization

KW - CMBR theory

KW - non-gaussianity

KW - physics of the early universe

UR - http://www.scopus.com/inward/record.url?scp=84907931362&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2014/10/011

DO - 10.1088/1475-7516/2014/10/011

M3 - Article

AN - SCOPUS:84907931362

VL - 2014

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 10

M1 - 011

ER -