Abstract
The CPT (Charge conjugation-Parity-Time reversal) invariance is a fundamental symmetry in particle physics. Testing CPT is a crucial way to examine the standard model of particle physics and for searching of new physics. In this paper we will review the method of testing CPT with high precision measurements of cosmic microwave background radiation (CMB) and the current status in this field. Compared with the results of laboratory experiments we find that CMB observations are more accurate to test the CPT symmetry.
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