Searching For CPT Violation With WMAP And BOOMERANG
Searching For CPT Violation With WMAP And BOOMERANG
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发表时间：
2006-01
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通讯作者：
Bo Feng;Mingzhe Li;J. Xia;Xuelei Chen;Xinmin Zhang
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作者：
Bo Feng;Mingzhe Li;J. Xia;Xuelei Chen;Xinmin Zhang
我们利用WMAP和2003年的B03飞行数据，在宇宙微波背景(CMB)的温度和偏振各向异性中寻找洛伦兹和$CPT$违规的特征。我们注意到，如果Lorentz对称性和$CPT对称性被有效拉格朗日中的Chern-Simons项破坏，即将对偶电磁场强度张量耦合到外部四个矢量，则传播的CMB光子的偏振矢量将发生旋转。仅使用WMAP数据，就可以对这样一个术语的大小施加一个有趣的限制。结合B03数据，我们发现一个非零的光子旋转角是比较有利的：$\Delta\α=-6.0^{+4.0}_{-4.0}$$^{+3.9}_{-3.7}$deg(1，2$\sigma$)。
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 $\sigma$).