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Observed CMB anisotropies are lensed, and the lensed power spectra can be calculated accurately assuming the lensing deflections are Gaussian.
Uros Seljak, “Gravitational lensing effect on cosmic microwave background anisotropies: A power spectrum approach,” Astrophys. J. 463
1996
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Wayne Hu, “Weak lensing of the CMB: A harmonic approach,” Phys. Rev. D62
2000
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Roman Scoccimarro and H. M. P. Couchman, “A fitting formula for the nonlinear evolution of the bispectrum,” Mon. Not. Roy. Astron. Soc. 325
2001
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F. Bernardeau, S. Colombi, E. Gaztanaga, and R. Scoccimarro, “Large scale structure of the universe and cosmological perturbation theory,” Phys. Rept. 367
2002
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R. E. Smith et al. (The Virgo Consortium), “Stable clustering, the halo model and nonlinear cosmological power spectra,” Mon. Not. Roy. Astron. Soc. 341
2003
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Anthony Challinor and Antony Lewis, “Lensed CMB power spectra from all-sky correlation functions,” Phys. Rev. D71
2005
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Antony Lewis and Anthony Challinor, “Weak gravitational lensing of the CMB,” Phys. Rept. 429
2006
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2011
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Antony Lewis, “The real shape of non-Gaussianities,” JCAP 1110
2011
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2012
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2015
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2015
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Geraint Pratten and Antony Lewis, “Impact of post-Born lensing on the CMB,” JCAP 1608
2016
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2016
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2012
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2013
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2017
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