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Precision Cosmology and the Density of Baryons in the Universe

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M. Kaplinghat, M.S. Turner

Astrophysics · Submitted 31 Jul 2000

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

The authors' main claim We clarify precisely what the two methods determine, and point out that differing values for the baryon density can indicate either an inconsistency or physics beyond the standard models of cosmology and particle physics.

how it is stated · hedged possibility 0.81 read the record →

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arXiv IDastro-ph/0007454 (version 2)
Pith IDAEI5PHDU, Pith's permanent record of this paper and its review
CitationM. Kaplinghat, M.S. Turner. "Precision Cosmology and the Density of Baryons in the Universe." arXiv:astro-ph/0007454 (2000). https://pith.science/paper/AEI5PHDU
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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-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,652 input tokens.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.17 · human participants 0.01 · controlled comparison 0.08 · randomized assignment 0.01 · states quantitative result 0.06 · compares with prior results 0.88 · mentions code or data availability 0.02.

The abstract, sentence by sentence

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

Big-bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) anisotropy measurements give independent, accurate measurements of the baryon density and can test the framework of the standard cosmology. Early CMB data are consistent with the longstanding conclusion from BBN that baryons constitute a small fraction of matter in the Universe, but may indicate a slightly higher value for the baryon density. We clarify precisely what the two methods determine, and point out that differing values for the baryon density can indicate either an inconsistency or physics beyond the standard models of cosmology and particle physics. We discuss other signatures of the new physics in CMB anisotropy.

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 Big-bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) anisotropy measurements give independent, accurate measurements of the baryon density and can test the framework of the standard cosmology. background 1.00 0.07 0.09 asserted 1.00
s1 Early CMB data are consistent with the longstanding conclusion from BBN that baryons constitute a small fraction of matter in the Universe, but may indicate a slightly higher value for the baryon density. background 0.77 0.12 0.15 hedged possibility 1.00
s2 We clarify precisely what the two methods determine, and point out that differing values for the baryon density can indicate either an inconsistency or physics beyond the standard models of cosmology and particle physics. contribution 0.84 0.80 0.41 hedged possibility 0.81
s3 We discuss other signatures of the new physics in CMB anisotropy. contribution 0.97 0.64 0.04 unclear 0.63

What kind of paper the classifier reports this is: position or commentary 0.91 · evidence from argument 0.45.

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
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  • P abstract
not run
  • 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

Big-bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) anisotropy measurements give independent, accurate measurements of the baryon density and can test the framework of the standard cosmology. Early CMB data are consistent with the longstanding conclusion from BBN that baryons constitute a small fraction of matter in the Universe, but may indicate a slightly higher value for the baryon density. We clarify precisely what the two methods determine, and point out that differing values for the baryon density can indicate either an inconsistency or physics beyond the standard models of cosmology and particle physics. We discuss other signatures of the new physics in CMB anisotropy.

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References
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3 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 · 2 sentences without a confident label

Cites it as background 1 paper
  • A deviation from the Standard Model prediction for $N_eff$ is not necessarily evidence for new neutrino physics: any unorthodox early-Universe expansion history, for example due to the presence of non-standard energy density (dubbed “dark radiation"), can be parametrized as a deviation from the expected number of neutrino species.[Provided the extra radiation responsible for changing the expansion is free-streaming: interacting dark radiation (and, indeed, neutrinos) impart different signatures (see Refs. [ref] ).] Limits on possible deviations from $= 3.046$ therefore place constraints on neutrino physics and on any other process that changes the expansion history [ref] .

    Is there evidence for additional neutrino species from cosmology? · Introduction · 0.83

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