AWhat changed
The Planck Collaboration reconstructed a noisy sky map of the cosmic microwave background lensing potential from the first 15 months of temperature data and estimated its power spectrum. Combining the relevant angular scales, the authors reported a lensing signal above 25σ and an approximately 4% constraint on the fiducial spectrum amplitude; cross-correlations with other tracers were also measured.
Scientific scope
The Planck Collaboration reconstructed a noisy sky map of the cosmic microwave background lensing potential from the first 15 months of temperature data and estimated its power spectrum. Combining the relevant angular scales, the authors reported a lensing signal above 25σ and an approximately 4% constraint on the fiducial spectrum amplitude; cross-correlations with other tracers were also measured. The 4% figure refers to a specified amplitude relative to a fiducial spectrum and is not a model-free four-percent measurement of every cosmological parameter. Each lensing-map mode is noise dominated. The main likelihood uses multipoles 40–400; low-multipole consistency failures and a higher-multipole channel discrepancy were reported outside that range.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The 4% figure refers to a specified amplitude relative to a fiducial spectrum and is not a model-free four-percent measurement of every cosmological parameter. Each lensing-map mode is noise dominated. The main likelihood uses multipoles 40–400; low-multipole consistency failures and a higher-multipole channel discrepancy were reported outside that range.
Contributors
- The named authors in the research record · SCIENCE: Credit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred.
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