## 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 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.

Original language | English |
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Article number | 011 |

Journal | Journal of Cosmology and Astroparticle Physics |

Volume | 2014 |

Issue number | 10 |

DOIs | |

State | Published - 1 Nov 2014 |

Externally published | Yes |

## Keywords

- CMBR polarization
- CMBR theory
- non-gaussianity
- physics of the early universe