2008/03/31 by Jun-Qing Xia, Hong Li, Gong-Bo Zhao +1 · 2 citations
Physics and Astronomy · #CMB cold spot #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Faraday effect #Neutrino Physics Research #Noncommutative and Quantum Gravity Theories #Observational cosmology #Photon #Polarization (electrochemistry) #Rotation (mathematics) #astro-ph
paper · pdf · doi:10.1086/589447
published as Astrophys.J.679:L61-L63,2008 · 3 pages, 1 figure, Some typos are corrected
arxiv created 2008/04/21 · openalex publication_date 2008/04/25 · arxiv updated 2010/11/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
In this Letter we update our previous results on the test of CPT symmetry with cosmic microwave background (CMB) measurements. A CPT-violating interaction in the photon sector gives rise to a rotation of the polarization vectors of the propagating CMB photons. Recently the WMAP group used the newly released polarization data of WMAP5 to measure this rotation angle Δ α and obtained Δα = –1.7° ± 2.1° (1 σ). However, in their analysis the BOOMERANG 2003 data are not included. Here we revisit this issue by combining the full data of WMAP5 and BOOMERANG 2003 angular power spectra for the measurement of this rotation angle Δ α and find that Δα = –2.6° ± 1.9° at a 68% confidence level.