Searching for CPT Violation with Cosmic Microwave Background Data from WMAP and BOOMERANG

Details Searching for CPT Violation with Cosmic Microwave Background Data from WMAP and BOOMERANG Searching for CPT Violation with Cosmic Microwave Background Data from WMAP and BOOMERANG

2006-01-05

arxiv.org/abs/astro-ph/0601095v3

Phys.Rev.Lett.96:221302,2006

Astronomy and Astrophysics

Astrophysics

Title slightly changed and references updated. Version pressed in PRL

Scientific paper

10.1103/PhysRevLett.96.221302

We search for signatures of Lorentz and $CPT$ violations in the cosmic microwave background (CMB) temperature and polarization anisotropies by using the WMAP and the 2003 flight of BOOMERANG (B03) data. We note that if the Lorentz and $CPT$ symmetries are broken by a Chern-Simons term in the effective lagrangian, which couples the dual electromagnetic field strength tensor to an external four-vector, the polarization vectors of propagating CMB photons will get rotated. Using the WMAP data alone, one could put an interesting constraint on the size of such a term. Combined with the B03 data, we found that a nonzero rotation angle of the photons is mildly favored: $\Delta \alpha= -6.0^{+4.0}_{-4.0}$ $^{+3.9}_{-3.7}$ deg (1, 2 $\sigma$).

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