Polarization of Cosmic Microwave Background

TL;DR

This paper extends a CMB polarization map-making code to include correlated noise, improving power spectrum estimates, especially for B-modes, demonstrated on BOOMERanG data with potential for future large-scale polarization experiments.

Contribution

The paper introduces a new algorithm that accounts for cross-correlated noise in CMB polarization data analysis, enhancing the accuracy of power spectrum estimation.

Findings

Reduced error bars in BB spectrum by up to 20% at low multipoles.

Validated the new method on BOOMERanG data.

Applicable to future large-scale polarization experiments like LSPE.

Abstract

In this work we present an extension of the ROMA map-making code for data analysis of Cosmic Microwave Background polarization, with particular attention given to the inflationary polarization B-modes. The new algorithm takes into account a possible cross-correlated noise component among the different detectors of a CMB experiment. We tested the code on the observational data of the BOOMERanG (2003) experiment and we show that we are provided with a better estimate of the power spectra, in particular the error bars of the BB spectrum are smaller up to 20% for low multipoles. We point out the general validity of the new method. A possible future application is the LSPE balloon experiment, devoted to the observation of polarization at large angular scales.