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The Lensing Template Left Half the B-Mode Power Behind
SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.
Summary
SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.
The team combined SPT-3G polarization and reconstructed lensing data with a Planck cosmic-infrared-background tracer, then tested estimators with different foreground immunity. Simulations put residual foreground bias below 10 percent of the template power spectrum's statistical uncertainty for the profile-hardened construction; data-difference tests found no significant contamination. Its residual lensing B-mode power averaged about 0.48 over the stated angular range, which the authors call the highest delensing efficiency for such a template to date; it has not detected primordial gravitational waves.
Why it matters
SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.
Limits and context
- Its residual lensing B-mode power averaged about 0.48 over the stated angular range, which the authors call the highest delensing efficiency for such a template to date; it has not detected primordial gravitational waves.
Key claims
SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.
Qualification: Its residual lensing B-mode power averaged about 0.48 over the stated angular range, which the authors call the highest delensing efficiency for such a template to date; it has not detected primordial gravitational waves.
Evidence: source-2026-08-08-011
Sources
- arXiv preprint 2608.06343arXiv · primary research
Corrections
No corrections have been recorded for this story.