Aspects of Symmetry for Flat Space Holography
Bibliographic record
Abstract
A central goal of modern high energy theory is to understand the structure of holographic dualities beyond asymptotically anti-de Sitter spacetimes. In asymptotically flat spacetimes, holographic dualities are expected to relate scattering amplitudes to correlation functions in a lower-dimensional theory living on the celestial sphere. However, it has proven challenging to construct examples of boundary theories with the full symmetry group of quantum gravity in flat spacetimes. In this thesis, we study how these bulk symmetries can emerge from lower-dimensional conformal field theories. After extending the celestial dictionary to (2,2)-signature Klein space, we show that fully Poincaré-invariant scattering amplitudes can emerge from building blocks of 2D CFTs. Next, we study how breaking translation invariance modifies the dual theory. We relate gluon scattering amplitudes in the presence of a translation-invariance breaking source to fundamental building blocks of the AdS/CFT correspondence. We then show that these translation- breaking backgrounds centrally extend the soft algebra of the dual theory, and use this to generate toy examples of celestial dualities for self-dual Yang-Mills with broken translation invariance. Finally, we study novel ways for Poincaré invariance to emerge from a lower-dimensional CFT. After showing that translation-invariant theories can emerge from entangled states in theories without translation invariance, we demonstrate that translation-invariant scattering amplitudes can be extracted from linear combinations of smooth CFT correlation functions. Ultimately, we construct an example where gluon scattering amplitudes can be extracted from a simple lower-dimensional theory
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.003 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.001 |
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".