Cosmological Parameters from Cosmic Background Imager Observations and Comparisons with BOOMERANG, DASI, and MAXIMA
Bibliographic record
Abstract
We report on the cosmological parameters derived from observations with the Cosmic Background Imager (CBI), covering 40 square degrees and the multipole range 300 <~ l <~ 3500. These unique, high-resolution observations show the seeds that gave rise to clusters of galaxies and also show damping in the power spectrum to l ~ 2000. Because the observations extend to much higher l the CBI results provide information complementary to that probed by the BOOMERANG, DASI, and MAXIMA experiments. When the CBI observations are used in combination with those from COBE-DMR, we find evidence for a flat universe, Omega(tot)=0.99 +/- 0.12 (1-sigma), a power law index of primordial fluctuations, n_s = 1.05(-0.08,+0.09), and densities in cold dark matter, Omega(cdm)h^2 = 0.17(-0.06,+0.08), and baryons, Omega(b)h^2 = 0.022(-0.009,+0.15). With the addition of large scale structure priors the Omega(cdm)h^2 value is sharpened to 0.12(-0.03,+0.03), and we find Omega(Lambda) = 0.64(-0.14,+0.11). In the l < 1000 overlap region with the BOOMERANG, DASI, and MAXIMA experiments, the agreement between these four experiments is excellent, and we construct optimal power spectra in the CBI bands which demonstrate this agreement. We derive cosmological parameters for the combined CMB experiments and show that these parameter determinations are stable as we progress from the weak priors using only CMB observations and very broad restrictions on cosmic parameters, through the addition of information from large scale structure surveys, Hubble parameter determinations and Supernova-1a results. [abridged]
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.001 |
| 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".