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A Messier Microwave Sky Barely Moved the Cosmology
Residual foreground power rose 50% over idealized estimates, while 11-parameter uncertainties increased less than 7%.
Summary
Residual foreground power rose 50% over idealized estimates, while 11-parameter uncertainties increased less than 7%.
CMB-HD foreground simulations cover 100 square degrees at 2.5-arcsecond resolution and include infrared sources, radio galaxies and galaxy clusters. After source detection and cleaning, residual foreground-plus-noise power at 90 and 148 gigahertz was 50% higher than earlier idealized assumptions. Even so, forecast uncertainties across an 11-parameter cosmology grew by less than 7%, helped by polarization, cross spectra and lensing. The released simulations forecast a proposed survey; they are not observed CMB-HD data.
Why it matters
Residual foreground power rose 50% over idealized estimates, while 11-parameter uncertainties increased less than 7%.
Limits and context
- The released simulations forecast a proposed survey; they are not observed CMB-HD data.
Key claims
Residual foreground power rose 50% over idealized estimates, while 11-parameter uncertainties increased less than 7%.
Qualification: The released simulations forecast a proposed survey; they are not observed CMB-HD data.
Evidence: source-2026-09-16-021
Sources
- arXiv preprint 2609.16128arXiv · primary research
Corrections
No corrections have been recorded for this story.