Why this work is in the frame
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Bibliographic record
Abstract
It has been noted a long time ago that a term of the form $\ensuremath{\theta}({e}^{2}/2\ensuremath{\pi}h)\mathbf{B}\ensuremath{\cdot}\mathbf{E}$ may be added to the standard Maxwell Lagrangian without modifying the familiar laws of electricity and magnetism. $\ensuremath{\theta}$ is known to particle physicists as the ``axion'' field and whether or not it has a nonzero expectation value in vacuum remains a fundamental open question of the standard model. A key manifestation of the axion term is the Witten effect: a unit magnetic monopole placed inside a medium with $\ensuremath{\theta}\ensuremath{\ne}0$ is predicted to bind a (generally fractional) electric charge $\ensuremath{-}e(\ensuremath{\theta}/2\ensuremath{\pi}+n)$ with $n$ integer. Here we conduct a test of the Witten effect based on the recently established fact that the axion term with $\ensuremath{\theta}=\ensuremath{\pi}$ emerges naturally in the description of the electromagnetic response of a class of crystalline solids called topological insulators---materials distinguished by strong spin-orbit coupling and nontrivial band structures. Using a simple physical model for a topological insulator we demonstrate the existence of a fractional charge bound to a monopole by an explicit numerical calculation. We also propose a scheme for generating an ``artificial'' magnetic monopole in a topological insulator film that may be used to facilitate an experimental test of Witten's prediction.
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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) | 0.002 | 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 it