Pith. Sign in

RECORD

The Cosmological Baryon Density from Deuterium in QSO Spectra

PaperPDF from arXiv

data files

Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
X Bluesky LinkedIn Reddit Hacker News
David Tytler, Scott Burles (University of California, San Diego)

Astrophysics · Submitted 18 Jun 1996

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

The authors' main claim We are confident that we have measured the primordial abundance of D (log D/H $= -4.62 \pm 0.05$), which is the first such measurement because other values in the literature are much larger, and apparently strongly contaminated.

how it is stated · asserted 1.00 read the record →

Comment (0) Read on arXiv ↗
Cite ▾
arXiv IDastro-ph/9606110 (version 2)
Pith IDUB3FT6LF, Pith's permanent record of this paper and its review
CitationDavid Tytler, San Diego), Scott Burles (University of California. "The Cosmological Baryon Density from Deuterium in QSO Spectra." arXiv:astro-ph/9606110 (1996). https://pith.science/paper/UB3FT6LF
Claim paper

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.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,961 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.87 · states limitation 0.56 · human participants 0.02 · controlled comparison 0.08 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.94 · mentions code or data availability 0.02.

The abstract, sentence by sentence

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

The primordial D/H ratio now provides the best measure of the cosmological density of baryons. We describe in detail how we deduce the D/H ratio from absorption lines in the spectra of quasars, and we present our first two measurements of D/H in different QSOs, which agree to within the random errors. We describe how we correct D/H for blending with Lyman alpha forest H lines. For our two QSOs these corrections are small, because the D lines are narrow, deep and constrained by H and metal lines. The similarity of the two measurements rules out ad hoc astrophysical effects, such as the destruction of D without production of metals, or unusual data problems. We are confident that we have measured the primordial abundance of D (log D/H $= -4.62 \pm 0.05$), which is the first such measurement because other values in the literature are much larger, and apparently strongly contaminated.

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 primordial D/H ratio now provides the best measure of the cosmological density of baryons. background 0.98 0.10 0.54 asserted 1.00
s1 We describe in detail how we deduce the D/H ratio from absorption lines in the spectra of quasars, and we present our first two measurements of D/H in different QSOs, which agree to within the random errors. contribution 0.93 0.97 0.09 asserted 1.00
s2 We describe how we correct D/H for blending with Lyman alpha forest H lines. method 0.99 0.94 0.02 asserted 0.91
s3 For our two QSOs these corrections are small, because the D lines are narrow, deep and constrained by H and metal lines. method 0.56 0.84 0.02 asserted 1.00
s4 The similarity of the two measurements rules out ad hoc astrophysical effects, such as the destruction of D without production of metals, or unusual data problems. interpretation 0.98 0.87 0.07 asserted 0.99
s5 We are confident that we have measured the primordial abundance of D (log D/H $= -4.62 \pm 0.05$), which is the first such measurement because other values in the literature are much larger, and apparently strongly contaminated. result 0.98 0.96 0.64 asserted 1.00

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.89.

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

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 primordial D/H ratio now provides the best measure of the cosmological density of baryons. We describe in detail how we deduce the D/H ratio from absorption lines in the spectra of quasars, and we present our first two measurements of D/H in different QSOs, which agree to within the random errors. We describe how we correct D/H for blending with Lyman alpha forest H lines. For our two QSOs these corrections are small, because the D lines are narrow, deep and constrained by H and metal lines. The similarity of the two measurements rules out ad hoc astrophysical effects, such as the destruction of D without production of metals, or unusual data problems. We are confident that we have measured the primordial abundance of D (log D/H $= -4.62 \pm 0.05$), which is the first such measurement because other values in the literature are much larger, and apparently strongly contaminated.

Human review

How Pith checks papers → · Full audit of this paper →

References

Discussion

Know something about this paper? Leave a comment, or highlight any passage above to comment on it.