Results from the Atacama B-mode Search (ABS) experiment
Bibliographic record
Abstract
The Atacama B-mode Search is an experiment designed to measure the cosmic \nmicrowave background polarization at large angular scales (` > 40). It observes at 145 GHz \nfrom a site at 5,190 m elevation in northern Chile. The noise equivalent polarization temperature, or NEQ, is 41 µK \n√ \ns. One of the unique features of ABS is its use of a rapidly \nrotating ambient-temperature half-wave plate (HWP) as the first optical element. The HWP \nspins at 2.55 Hz to modulate the incident polarized signal at frequencies above where instrument white noise dominates over atmospheric fluctuations and other sources of low-frequency \nnoise. We report here on the analysis of data from a 2,400 deg2 \nregion of sky. We perform a \nblind analysis to reduce potential bias. After unblinding, we find agreement with the Planck \nTE and EE measurements on the same region of sky, with a derived calibration factor of \n0.89 ± 0.10. We marginally detect polarized dust emission (at 3.2 σ for EE and 2.2 σ for \nBB) and give an upper limit on the tensor-to-scalar ratio of r < 2.3 (95% confidence level) \nwith the equivalent of 100 on-sky days of observation. We also present a new measurement \nof the polarization of Tau A and introduce new methods for calibration and data analysis \nassociated with HWP-based observations.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".