Bibliographic record
Abstract
The Earth's longest free mode of nutation, the inner core wobble (ICW), consists of a prograde precession of the tilted figure of the inner core with respect to a fixed mantle. The dynamics of the ICW is controlled by coupling at the inner-core boundary (ICB) and by the torque exerted by the rest of the Earth on a tilted inner core. This mode has not yet been observed either directly or indirectly, though theoretical estimates suggest its period should be 2410 solar days or 6.6 yr. However, these estimates were based on models that did not properly take into account elastic deformations associated with a tilted inner core. In this work, we incorporate these elastic deformations in a model of free nutations that rests on an angular momentum formalism. We find that based on an elastic, oceanless and dissipationless earth model corresponding to PREM, elastic deformations within the inner core contribute to a lengthening of the period of the ICW from 2410 to 2715 solar days. The internal forcing caused by the misalignment between surfaces of constant density and centrifugal potential is the most important contribution to elastic deformations.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".