An efficient probe of the cosmological CPT violation

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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.