Searching for CPT Violation with Cosmic Microwave Background Data from WMAP and BOOMERANG
Abstract
We search for signatures of Lorentz and CPT violations in the cosmic microwave background (CMB) temperature and polarization anisotropies by using the Wilkinson Microwave Anisotropy Probe (WMAP) and the 2003 flight of BOOMERANG (B03) data. We note that if the Lorentz and CPT symmetries are broken by a ChernSimons term in the effective Lagrangian, which couples the dual electromagnetic field strength tensor to an external fourvector, 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: ∆α=6.0(+4.0)/(4.0)(+3.9)/(3.7)deg(1,2σ).
 Publication:

Physical Review Letters
 Pub Date:
 June 2006
 DOI:
 10.1103/PhysRevLett.96.221302
 arXiv:
 arXiv:astroph/0601095
 Bibcode:
 2006PhRvL..96v1302F
 Keywords:

 98.80.Es;
 11.30.Cp;
 11.30.Er;
 Observational cosmology;
 Lorentz and Poincare invariance;
 Charge conjugation parity time reversal and other discrete symmetries;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 Title slightly changed and references updated. Version pressed in PRL