Radion dynamics in a five-dimensional brane-world : from the hierarchy problem to a four-dimensional inflationary universe
Bibliographic record
Abstract
Inspired by the Randall-Sundrum (RS) solution to the weak-scale hierarchy problem we present a new five-dimensional brane-world model. While many cosmological implications of RS-type scenarios have been considered, the question of inflation is still relatively unexplored. In this work we investigate the dynamics induced by fluctuations in the extra dimension and find that the so-called radion can be used for inflation. A class of models are found which simultaneously allow for radius stabilization by utilizing a bulk scalar field with a potential in the bulk and on the branes. The coupled radion-scalar field system is analyzed from the five-dimensional point of view and is seen to consistently reduce to a four-dimensional Friedmann-Robertson-Walker-like cosmology. An analysis of the constraints imposed during inflation fixes the radion mass and we speculate on the possibility that the new physics at work here may be distinguishable from typical four-dimensional models.
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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 | 0.000 |
| 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 | 0.001 | 0.002 |
| 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".