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 2.3σ confidence level, i.e., bar alpha=−3.3o±1.4o (68% CL) with systematics included.
|Journal||Journal of Cosmology and Astroparticle Physics|
|Publication status||Published - 21 Jul 2015|