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Assisted Contraction

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Fabio Finelli (IASF/CNR, Bologna)

High Energy Physics - Theory · Submitted 13 Jun 2002

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

The authors' main claim We find the conditions for which a scale invariant spectrum for isocurvature perturbation is generated.

how it is stated · asserted 1.00 read the record →

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arXiv IDhep-th/0206112 (version 2)
Pith IDXTXGCQEH, Pith's permanent record of this paper and its review
CitationBologna), Fabio Finelli (IASF/CNR. "Assisted Contraction." arXiv:hep-th/0206112 (2002). https://pith.science/paper/XTXGCQEH
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The compiled record

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, 4,103 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.72 · human participants 0.01 · controlled comparison 0.04 · randomized assignment 0.01 · states quantitative result 0.20 · compares with prior results 0.72 · mentions code or data availability 0.02.

The abstract, sentence by sentence

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

We consider the dynamics of a contracting universe ruled by two minimally coupled scalar fields with general exponential potentials. This model describes string-inspired scenarios in the Einstein frame. Both background and perturbations can be solved analytically in this model. Curvature perturbations are generated with a scale invariant spectrum only for a dust-like collapse, as happens for a single field model with an exponential potential. We find the conditions for which a scale invariant spectrum for isocurvature perturbation is generated.

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 We consider the dynamics of a contracting universe ruled by two minimally coupled scalar fields with general exponential potentials. contribution 0.67 0.45 0.05 asserted 0.92
s1 This model describes string-inspired scenarios in the Einstein frame. background 0.62 0.13 0.03 asserted 1.00
s2 Both background and perturbations can be solved analytically in this model. method 0.61 0.71 0.08 asserted 0.99
s3 Curvature perturbations are generated with a scale invariant spectrum only for a dust-like collapse, as happens for a single field model with an exponential potential. result 0.99 0.37 0.32 asserted 1.00
s4 We find the conditions for which a scale invariant spectrum for isocurvature perturbation is generated. result 0.73 0.95 0.26 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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  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
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  • P abstract
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  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

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

We consider the dynamics of a contracting universe ruled by two minimally coupled scalar fields with general exponential potentials. This model describes string-inspired scenarios in the Einstein frame. Both background and perturbations can be solved analytically in this model. Curvature perturbations are generated with a scale invariant spectrum only for a dust-like collapse, as happens for a single field model with an exponential potential. We find the conditions for which a scale invariant spectrum for isocurvature perturbation is generated.

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References
How the literature uses it

33 arXiv papers cite this in 49 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 · 34 sentences without a confident label

Compares with it 1 paper
  • Whereas in models with a singular bounce such as the Pre-Big-Bang [ref] and the Ekpyrotic [ref] scenarios, the perturbations must be matched across a singular space-like surface, which leads to serious conceptual problems [ref] , in our case no such problems arise [Recently, a ghost condensation mechanism to smooth out the singularity in the Ekpyrotic scenario has been introduced [ref] , and it has been shown in this context, using the techniques developed in [ref] that making use of iso-curvature modes, the dominant spectrum in the contracting phase can be passed on to the dominant spectrum in the expanding phase.].

    On Perturbations of Quintom Bounce · Discussion And Conclusions · 0.83

Cites it as background 13 papers
  • The authors of [ref] found a scaling solution (previously studied in [ref] ) in which both fields roll down their potential as the universe approaches a big crunch singularity.

    Curvature perturbations from ekpyrotic collapse with multiple fields · Homogeneous field dynamics · 0.90

  • Here, we briefly summarise the results obtained in the previous works [ref] about the generation and the evolution of linear fluctuations of the $χ$ field about the background multi-field scaling solution.

    Non-Gaussianities from ekpyrotic collapse with multiple fields · Linear field fluctuations · 0.97

  • Regarding the first step of the entropic mechanism, two classes of the scalar field $χ$ have been studied in the literature: the entropic field $χ$ has a canonical kinetic term and an unstable potential [ref] , or the entropic field $χ$ has a non-minimal kinetic coupling to the ekpyrotic scalar field [ref] .

    Fully viable DHOST bounce with extra scalar · Introduction · 0.96

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