Detection of gravitational lensing in the cosmic microwave background

@article{Smith2007DetectionOG,
  title={Detection of gravitational lensing in the cosmic microwave background},
  author={Kendrick Smith and Oliver Zahn and Olivier Dor{\'e}},
  journal={Physical Review D},
  year={2007},
  volume={76},
  pages={043510}
}
Gravitational lensing of the cosmic microwave background (CMB), a long-standing prediction of the standard cosmological model, is ultimately expected to be an important source of cosmological information, but first detection has not been achieved to date. We report a 3.4{sigma} detection, by applying quadratic estimator techniques to all sky maps from the Wilkinson microwave anisotropy probe (WMAP) satellite, and correlating the result with radio galaxy counts from the NRAO VLA sky survey (NVSS… 
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