Dipole Modulation in Tensor Modes: Signatures in CMB Polarization

TL;DR

This paper investigates how a dipole asymmetry in tensor modes affects CMB polarization, deriving analytical expressions for temperature and B-mode spectra, highlighting significant modifications in B-mode polarization.

Contribution

It introduces an analytical framework for understanding dipole modulation effects in tensor modes on CMB spectra, focusing on low multipoles.

Findings

Dipole asymmetry significantly alters the $C_{l}^{BB}$ spectrum.

Analytical expressions for $C_{l}^{TT}$ and $C_{l}^{BB}$ are derived for $l<100$.

The amplitude of the modulation term impacts the B-mode polarization notably.

Abstract

In this work we consider a dipole asymmetry in tensor modes and study the effects of this asymmetry on the angular power spectra of CMB. We derive analytical expressions for the $C_{l}^{TT}$ and $C_{l}^{BB}$ in the presence of such dipole modulation in tensor modes for $l<100$. We also discuss on the amplitude of modulation term and show that the $C_{l}^{BB}$ is considerably modified due to this term.