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Brane World Cosmology Without the Z_2 Symmetry

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Anne-Christine Davis, Ian Vernon, Stephen C. Davis, Warren B. Perkins

High Energy Physics - Phenomenology · Submitted 14 Aug 2000

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We show that any brane world senario of this type must revert to a Z_2 symmetric form at late times, and hence rule out certain proposed scenarios.

how it is stated · asserted 1.00 read the record →

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arXiv IDhep-ph/0008132 (version 2)
Pith IDWA4IASAQ, Pith's permanent record of this paper and its review
CitationAnne-Christine Davis, Ian Vernon, Stephen C. Davis, Warren B. Perkins. "Brane World Cosmology Without the Z_2 Symmetry." arXiv:hep-ph/0008132 (2000). https://pith.science/paper/WA4IASAQ
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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. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,034 input tokens, $0.0001 reported.

What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.49 · human participants 0.01 · controlled comparison 0.48 · randomized assignment 0.01 · states quantitative result 0.07 · compares with prior results 0.93 · mentions code or data availability 0.01.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z_2 symmetry of the metric itself is derived, and the possible effects of dropping the Z_2 symmetry on the expansion of our Universe are examined; cosmological constraints are discussed. The global solutions for the metric in the infinite extra dimension case are found and comparison with the symmetric case is made. We show that any brane world senario of this type must revert to a Z_2 symmetric form at late times, and hence rule out certain proposed scenarios.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z_2 symmetry of the metric itself is derived, and the possible effects of dropping the Z_2 symmetry on the expansion of our Universe are examined; cosmological constraints are discussed. contribution 1.00 0.94 0.12 asserted 0.93
s1 The global solutions for the metric in the infinite extra dimension case are found and comparison with the symmetric case is made. contribution 0.64 0.94 0.04 asserted 1.00
s2 We show that any brane world senario of this type must revert to a Z_2 symmetric form at late times, and hence rule out certain proposed scenarios. result 0.84 0.93 0.86 asserted 1.00

What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from proof or derivation 1.00.

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  • references and citing sentences
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  • S sections
  • T body sentences
  • C citations
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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z_2 symmetry of the metric itself is derived, and the possible effects of dropping the Z_2 symmetry on the expansion of our Universe are examined; cosmological constraints are discussed. The global solutions for the metric in the infinite extra dimension case are found and comparison with the symmetric case is made. We show that any brane world senario of this type must revert to a Z_2 symmetric form at late times, and hence rule out certain proposed scenarios.

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2 arXiv papers cite this in 3 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 1 sentence without a confident label

Cites it as background 2 papers
  • Second, our analysis assumes $ℤ_2$ symmetry and a static bulk mass parameter; relaxing these assumptions, allowing for asymmetric embeddings [ref] , brane-bulk energy exchange, or time-dependent bulk black hole mass would clarify how general the inflationary mechanism remains beyond the present setup.

    Cosmic Inflation From Regular Black Holes · Conclusion and discussion · 0.81

  • It is widely assumed that in braneworld scenarios $Z_2$-symmetry is imposed [ref] and under this symmetry, which originated in $M$-theory, the bulk metric on both sides of the brane should be the same [ref] .

    Thick branes via higher order field theory models with exponential and power-law tails · Introduction · 0.87

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