Astrophysics · arXiv:astro-ph/9706034 v2 · submitted 4 Jun 1997
Cosmological redshift distortion: deceleration, bias and density parameters from future redshift surveys of galaxies
The paper says
“Although such systematic errors are smaller than the statistical errors in the current surveys, they will dominate the expected statistical error for future surveys.”
from the abstract · picked out as the main claim by a classifier
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Abstract
The observed two-point correlation functions of galaxies in redshift space become anisotropic due to the geometry of the universe as well as due to the presence of the peculiar velocity field. On the basis of linear perturbation theory, we expand the induced anisotropies of the correlation functions with respect to the redshift z, and obtain analytic formulae to infer the deceleration parameter q0, the density parameter Ω0 and the derivative of the bias parameter dlnb/dz at z = 0 in terms of the observable statistical quantities. The present method does not require any assumption of the shape and amplitude of the underlying fluctuation spectrum, and thus can be applied to future redshift surveys of galaxies including the Sloan Digital Sky Survey. We also evaluate quantitatively the systematic error in estimating the value of β0 ≡ Ω00.6/b from a galaxy redshift survey on the basis of a conventional estimator for β0 which neglects both the geometrical distortion effect and the time evolution of the parameter β(z). If the magnitude limit of the survey is as faint as 18.5 (in B-band) as in the case of the Sloan Digital Sky Survey, the systematic error ranges between -20% and 10% depending on the cosmological parameters. Although such systematic errors are smaller than the statistical errors in the current surveys, they will dominate the expected statistical error for future surveys.
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 0.90
What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.41 · human participants 0.01 · controlled comparison 0.11 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.88 · 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 |
|---|---|---|---|---|
| The observed two-point correlation functions of galaxies in redshift space become anisotropic due to the geometry of the universe as well as due to the presence of the peculiar velocity field. | background 1.00 | 0.09 | 0.04 | asserted 1.00 |
| On the basis of linear perturbation theory, we expand the induced anisotropies of the correlation functions with respect to the redshift $z$, and obtain analytic formulae to infer the deceleration parameter $q_0$, the density parameter $\Omega_0$ and the derivative of the bias parameter $d\ln b/dz$ at $z=0$ in terms of the observable statistical quantities. | method 0.66 | 0.95 | 0.48 | asserted 1.00 |
| The present method does not require any assumption of the shape and amplitude of the underlying fluctuation spectrum, and thus can be applied to future redshift surveys of galaxies including the Sloan Digital Sky Survey. | contribution 0.48 | 0.67 | 0.14 | asserted 0.99 |
| We also evaluate quantitatively the systematic error in estimating the value of $\beta_0 \equiv \Omega_0^{0.6}/b$ from a galaxy redshift survey on the basis of a conventional estimator for $\beta_0$ which neglects both the geometrical distortion effect and the time evolution of the parameter $\beta(z)$. | contribution 0.74 | 0.89 | 0.08 | asserted 1.00 |
| If the magnitude limit of the survey is as faint as 18.5 (in B-band) as in the case of the Sloan Digital Sky Survey, the systematic error ranges between -20% and 10% depending on the cosmological parameters. | result 1.00 | 0.87 | 0.12 | asserted 0.98 |
| Although such systematic errors are smaller than the statistical errors in the current surveys, they will dominate the expected statistical error for future surveys. | interpretation 0.98 | 0.68 | 0.34 | asserted 0.90 |
What kind of paper the classifier reports this is: theoretical result 0.51 · evidence from proof or derivation 1.00
What was examined, and what was not
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- arXiv listing abstract v2
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- full text
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- P abstract
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- S sections
- T body sentences
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How the labels were made
Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,326 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 2 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Lensing and time-delay contributions to galaxy correlations astro-ph.CO · Nov 2013
- Linear Redshift Distortions: A Review astro-ph · Aug 1997
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