High Energy Physics - Theory · arXiv:hep-th/0508068 v2 · submitted 10 Aug 2005
pp Wave Big Bangs: Matrix Strings and Shrinking Fuzzy Spheres
The paper says
“We show that, for a class of pp waves, fuzzy cylinders which start out big at early times dynamically shrink into usual strings at sufficiently late times.”
from the abstract · picked out as the main claim by a classifier
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The paper
Abstract
We find pp wave solutions in string theory with null-like linear dilatons. These provide toy models of big bang cosmologies. We formulate Matrix String Theory in these backgrounds. Near the big bang “singularity”, the string theory becomes strongly coupled but the Yang-Mills description of the matrix string is weakly coupled. The presence of a second length scale allows us to focus on a specific class of non-abelian configurations, viz. fuzzy cylinders, for a suitable regime of parameters. We show that, for a class of pp waves, fuzzy cylinders which start out big at early times dynamically shrink into usual strings at sufficiently late times.
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. No sentence in this record was written by a model.
abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 1.00
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.39 · human participants 0.01 · controlled comparison 0.02 · randomized assignment 0.01 · states quantitative result 0.05 · compares with prior results 0.09 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v2). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| We find pp wave solutions in string theory with null-like linear dilatons. | result 0.66 | 0.93 | 0.06 | asserted 1.00 |
| These provide toy models of big bang cosmologies. | interpretation 0.96 | 0.49 | 0.08 | asserted 0.94 |
| We formulate Matrix String Theory in these backgrounds. | contribution 0.54 | 0.94 | 0.04 | asserted 0.99 |
| Near the big bang ``singularity'', the string theory becomes strongly coupled but the Yang-Mills description of the matrix string is weakly coupled. | result 0.92 | 0.84 | 0.18 | asserted 1.00 |
| The presence of a second length scale allows us to focus on a specific class of non-abelian configurations, viz. fuzzy cylinders, for a suitable regime of parameters. | method 0.59 | 0.80 | 0.07 | asserted 0.94 |
| We show that, for a class of pp waves, fuzzy cylinders which start out big at early times dynamically shrink into usual strings at sufficiently late times. | result 1.00 | 0.95 | 0.70 | asserted 1.00 |
What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from proof or derivation 0.99
What was examined, and what was not
Sources read
- arXiv listing abstract v2
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
Not run
- 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, 4,771 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 5 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Matrix Model in a Class of Time Dependent Supersymmetric Backgrounds hep-th · Mar 2006
- Toward the End of Time hep-th · Mar 2006
- Late time behaviors of the expanding universe in the IIB matrix model hep-th · Aug 2012
- Time Dependent Cosmologies and Their Duals hep-th · Feb 2006
- Review of M(atrix)-Theory, Type IIB Matrix Model and Matrix String Theory hep-th · Aug 2017
How the literature uses it
8 arXiv papers cite this in 9 sentences
Papers citing it · 5 sentences without a confident label
Cites it as background 4 papers
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Based on these proposals, various issues of the early universe have been discussed [ref] .
A renormalization group method for studying the early universe in the Lorentzian IIB matrix model · Introduction · 0.99
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[ref] .] the IIB matrix model [ref] looks most natural
Late time behaviors of the expanding universe in the IIB matrix model · Introduction · 0.94
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This string theory contains fuzzy spheres in its spectrum, whose various aspects also have been studied [ref] - [ref] .
Probing Smearing Effect by Point-Like Graviton in Plane-Wave Matrix Model · Introduction · 0.96
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