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2010

CMB Lensing - Power Without Bias

Sherwin, Blake D., Das, Sudeep

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We propose a novel bias-free method for reconstructing the power spectrum of the weak lensing deflection field from cosmic microwave background (CMB) observations.

The proposed method is in contrast to the standard method of CMB lensing reconstruction where a reconstruction bias needs to be subtracted to estimate the lensing power spectrum.
This bias depends very sensitively on the modeling of the signal and noise properties of the survey, and a misestimate can lead to significantly inaccurate results.
Our method obviates this bias and hence the need to characterize the detailed noise properties of the CMB experiment.

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M. Zaldarriaga and U. Seljak, Phys. Rev. D 58
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U. Seljak and M. Zaldarriaga, Physical Review Letters 82
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W. Hu and T. Okamoto, ApJ 574
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Earlier work this paper cites.

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