AWhat changed
Smith, Zahn and Doré reconstructed a noisy gravitational-lensing potential from WMAP temperature maps and cross-correlated it with radio-source counts from the NVSS survey. They reported a 3.4σ lensing signal including their modeled systematic errors, an early observational detection of CMB lensing.
Scientific scope
Smith, Zahn and Doré reconstructed a noisy gravitational-lensing potential from WMAP temperature maps and cross-correlated it with radio-source counts from the NVSS survey. They reported a 3.4σ lensing signal including their modeled systematic errors, an early observational detection of CMB lensing. The detection is a statistical cross-correlation using an external tracer, not a high-significance internal CMB-only lensing map. The quoted significance depends on the analysis and systematic-error model; the curl null test does not test every parity-symmetric contaminant. The authors did not infer a fully calibrated cosmological parameter constraint because source redshift distribution and galaxy bias were uncertain.
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 detection is a statistical cross-correlation using an external tracer, not a high-significance internal CMB-only lensing map. The quoted significance depends on the analysis and systematic-error model; the curl null test does not test every parity-symmetric contaminant. The authors did not infer a fully calibrated cosmological parameter constraint because source redshift distribution and galaxy bias were uncertain.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
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