High Energy Physics - Phenomenology · arXiv:hep-ph/0309221 v1 · submitted 18 Sep 2003
On CPT Symmetry: Cosmological, Quantum-Gravitational and other possible violations and their phenomenology
The paper says
“I argue that the majority of Lorentz-violating cases of CPT breaking, with minimal (linear) suppression by the Planck-mass scale, are already excluded by current experimental tests.”
from the abstract · picked out as the main claim by a classifier
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The paper
Abstract
I discuss various ways in which CPT symmetry may be violated, and their phenomenology in current or immediate future experimental facilities, both terrestrial and astrophysical. Specifically, I discuss first violations of CPT symmetry due to the impossibility of defining a scattering matrix as a consequence of the existence of microscopic or macroscopic space-time boundaries, such as Planck-scale Black-Hole (event) horizons, or cosmological horizons due to the presence of a (positive) cosmological constant in the Universe. Second, I discuss CPT violation due to breaking of Lorentz symmetry, which may characterize certain approaches to quantum gravity, and third, I describe models of CPT non invariance due to violations of locality of interactions. In each of the above categories I discuss experimental sensitivities. I argue that the majority of Lorentz-violating cases of CPT breaking, with minimal (linear) suppression by the Planck-mass scale, are already excluded by current experimental tests. There are however some (stringy) models which can evade these constraints.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 0.97
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.34 · human participants 0.02 · controlled comparison 0.03 · randomized assignment 0.01 · states quantitative result 0.10 · compares with prior results 0.27 · mentions code or data availability 0.01
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v1). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| I discuss various ways in which CPT symmetry may be violated, and their phenomenology in current or immediate future experimental facilities, both terrestrial and astrophysical. | contribution 1.00 | 0.78 | 0.07 | hedged possibility 0.84 |
| Specifically, I discuss first violations of CPT symmetry due to the impossibility of defining a scattering matrix as a consequence of the existence of microscopic or macroscopic space-time boundaries, such as Planck-scale Black-Hole (event) horizons, or cosmological horizons due to the presence of a (positive) cosmological constant in the Universe. | contribution 0.98 | 0.41 | 0.05 | asserted 0.69 |
| Second, I discuss CPT violation due to breaking of Lorentz symmetry, which may characterize certain approaches to quantum gravity, and third, I describe models of CPT non invariance due to violations of locality of interactions. | contribution 0.99 | 0.49 | 0.04 | hedged possibility 0.78 |
| In each of the above categories I discuss experimental sensitivities. | contribution 0.88 | 0.78 | 0.04 | asserted 0.96 |
| I argue that the majority of Lorentz-violating cases of CPT breaking, with minimal (linear) suppression by the Planck-mass scale, are already excluded by current experimental tests. | result 0.79 | 0.37 | 0.40 | asserted 0.97 |
| There are however some (stringy) models which can evade these constraints. | result 0.62 | 0.22 | 0.13 | asserted 0.76 |
What kind of paper the classifier reports this is: review 0.99 · evidence from argument 0.70
What was examined, and what was not
Sources read
- arXiv listing abstract v1
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
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- S sections
- T body sentences
- C citations
- R cross-paper relations
How the labels were made
Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,030 input tokens, $0.0002 reported.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 3 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Einstein-Aether Waves gr-qc · Feb 2004
- Lorentz and CPT Invariance Violation In High-Energy Neutrinos hep-ph · Jun 2005
- A Possible Quantum-Gravitational Origin of the Neutrino Mass Difference ? hep-ph · Apr 2006
How the literature uses it
1 arXiv paper cite this in 1 sentence
Papers whose main result relates to this one's
States the same result 1 paper
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As I shall argue, severe constraints can be placed in CPT violating parameters, with sensitivities that can safely exclude models with effects suppressed by a single power of Planck mass.
Theoretical and Phenomenological Aspects of CPT Violation · 0.90
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