An efficient probe of the cosmological CPT violation

TL;DR

This paper introduces a new linear regression-based method to efficiently detect cosmological CPT violation using CMB polarization data, validated with simulations and applied to real observations, indicating a potential nonzero isotropic rotation angle.

Contribution

The paper presents a novel, efficient linear regression approach for probing cosmological CPT violation with CMB data, validated through simulations and applied to recent observations.

Findings

Combined BICEP1 and BOOMERanG data suggest a nonzero isotropic rotation angle at 2.3σ confidence.

The method successfully detects a rotation angle of -3.3 ± 1.4 degrees.

Validation with simulated data confirms the method's reliability.

Abstract

We develop an efficient method based on the linear regression algorithm to probe the cosmological CPT violation using the CMB polarisation data. We validate this method using simulated CMB data and apply it to recent CMB observations. We find that a combined data sample of BICEP1 and BOOMERanG 2003 favours a nonzero isotropic rotation angle at $2.3\sigma$ confidence level, ie, $\Delta\alpha=-3.3 \pm1.4$ deg (68% CL) with systematics included.